Caring for. Lee says. Technology is showing us that even the world of vision correction is evolving by curating gas-permeable contact lenses. Use diagnostic contact lenses for all bifocal and multifocal designs. 2 mm diameter Menicon Z, 7. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. Get them in Boynton Beach & Naples FL. These lenses are smaller in diameter than soft contact lenses and rest on a layer of tears above the margin of your lower eyelid. 50D or greater. They are called gas permeable contact lenses (GP, GPL, GPCL or RGP), or merely rigid contact lenses, and they usually contain silicone acrylate or fluorosilicone acrylate. Contact him at (515) 243-1667. X-Cel Specialty Contacts understands the critical need for eye care professionals to have a choice when it comes to prescribing specialty GP lenses for the management of myopia for patients of all ages. Lens design. There are two categories of contact lenses based on. Intralimbal lenses (10. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. In the last year, two new GP materials were launched that may be useful in the fitting of scleral lenses. Removing a Gas Permeable Contact Lens. During primary gaze, upward gaze and between blinks, the upper edge of the lens should be retained under the upper lid. Fits up to 95% of all contact lens candidates. Made of moderately flexible plastics, GP lenses offer sharp vision and correct most vision problems. Try to get into the. People with specific vision problems may find. Hybrid lenses can correct astigmatism. Paragon Vision Sciences (cont'd. GP lenses are custom-lathed (machined) to a smooth surface and maintain their shape on the eye. Dr. com. Scleral lenses have made gas permeable (GP) lenses appetizing again, and as a result, there is a renewed focus on finding ways to perfect the process of making GP lenses. 3. ABB Contact Lens Catalog Soft, Custom Soft & Gas Permeable Contact Lenses; ABB Specialty Vision Products Custom Soft & Gas Permeable Lenses; ABB Single-Source Distribution Dry Eye Care Lab Services ABB Labs Catalog. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. In terms of comfort, visual clarity and stability, scleral lenses are superior to gas permeable lenses. 2008 Jul;34:198-200. From GP Lens Institute. 1995;14(2):121-9. Enhanced comfort through edge lift control. [1,2,3,4,5] Fitting of GP lenses in keratoconus patients and achieving an acceptable fit can be considered challenging for eye care practitioners due to keratoconus being a progressive. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. Consider custom lenses in these cases. Lens material. The goal of our optometrists is achieving exceptional family eye care with complete patient satisfaction. 3. brand 1-800-GET-LENS ® - Gas Permeable Contacts - LOWEST PRICE GUARANTEE on all Gas Permeable contact lenses. Gas permeable lenses provide a better oxygen supply than most soft lenses because:. REMLens® features a four-curve, reverse geometry design with an advanced and revolutionary Dynamic Edge Profile™ providing superior on-eye. Raleigh. Poor Near Acuity. Hassle-Free Ordering & Express Delivery. Soft contact lenses are thin and flexible, so they mold easily to the shape of your eye. Gas permeable lenses do not dehydrate, which is also a cause for reduced vision with other contact lenses. Boston Simplus Contact Lens Solution, for Gas Permeable Contact Lenses, 3. Rinse the stuck contact and your eye for a few seconds with a steady stream of sterile saline, multipurpose contact lens solution or contact lens rewetting drops. GP contact lenses are made of a firm, durable plastic that transmits oxygen. Oxygen transmissibility across. Corneal GP Lenses The conventional standard for managing keratoconus has been corneal GP lenses. is the MiSight 1-day lenses by CooperVision. They provide sharper vision. While these lenses are rigid, they should not be confused with the hard contact lenses of decades past. Figure 2. Soft contacts are great at. RGP lenses have the ability to let oxygen reach the eye behind the lens, which is essential for good eye health. Soft contact lenses have their disadvantages too, including a higher rate of infection and less durability than gas permeable. 85mm), a steeper base curve lens was ordered (7. She reported night vision difficulties and horizontal injection. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. Scleral contact lenses. The GP lens can be made with single vision optics or multifocal optics, which can give patients more options when it comes to multifocal designs. 2 mm diameter Menicon Z, 7. CLAO J. What are gas permeable contact lenses? Gas permeable lenses are rigid lenses. A large gas permeable contact lens, the G. Edwards K. Because GP lenses are made with oxygen-permeable silicone, they allow more oxygen to reach the front surface of the eye than traditional hydrogel soft. Many types of lenses can be used in the management of patients who have undergone corneal transplantation (ranging from full-thickness keratoplasty to anterior and posterior lamellar keratoplasties), including custom soft. Replacement schedule. Lens thickness variance across scleral, corneal gas permeable (GP) and custom soft lenses is particularly evident with high back surface powers. There are a number of gas permeable lens designs that can be tried before turning to other options. Development of the AGREE II, Part 2: Assessment of validity of. The main goal of this current work is to use an updated calculation paradigm, and updated boundary conditions, to provide theoretical guidelines to assist the clinician whose goal is to improve his or her scleral. Special features. For lenses from 16mm to 30mm, a larger case may. 2. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. If the preselection criteria have been met, the diagnostic evaluation can begin. Scleral lenses have made gas permeable (GP) lenses appetizing again, and as a result, there is a renewed focus on finding ways to perfect the process of making GP lenses. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. With lower material costs and less chair time, the fitting. This can also be caused by protein buildup, which can usually be cleaned off, but if that doesn’t work, it may be the quality of GP lenses themselves. Gas Permeable (GP) Contact Lenses. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. GP lenses provide sharper vision than soft lenses which can fluctuate in shape and clarity as they start to dry out. Your eye doctor may call them GPs or RGPs. 1. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. Disposable (Replacement Schedule) Contact Lenses. Contact lens wearing time. 1–3 They account for about 10% of fits worldwide (with considerable intercountry variation) and hold a steadily. Gas Permeable Contact Lens. 00D of with-the-rule astigmatism. This increases comfort and maintains eye health. 1. . However, I started developing some lens intolerance, and dry eye was still an issue for me, so it decreased my wearing time. Many translating GP lens designs have lined or blended lens segments dedicated to distance, intermediate, and near working distances, which can be manipulated independently of one. Wash your hands with soap and water. Gas permeable contact lenses. 67 ± 0. Rigid gas permeable lenses. Despite their name, ‘rigid’ gas permeable contact lenses are actually quite flexible. GP contact lenses are made of a firm, durable plastic that transmits oxygen. 19. Kanpolat A, Ciftci OU. Effective lens cleaning solution for gas permeable (GP) and hard contact lenses. 7 Scleral Lenses; 3. A retrospective analysis of 343 cases. Areas of specialty are also designated: General GP contact lenses. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. Bier N, Lowther GE. Contact Lens Spectrum. Dry your hands with a clean, lint-free towel. Of the various types of gas permeable lenses, the most underutilized and underrated are small-diameter corneal GP lenses. In most cases, GP lenses can correct astigmatism without a specialized toric design. . The lenses were often difficult to remove at the end of. Miller today for a trial fitting. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. Contact Lenses for the Hard to Fit Patient. Contact lenses for people with astigmatism, dry eyes, presbyopia, giant papillary conjunctivitis (GPC), keratoconus or post-LASIK problems. Their large size helps correct vision problems caused by an irregularly shaped cornea (like corneal scars, keratoconus or surgery). This attribute grants them several advantages over traditional soft contact lenses. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. And, like GP contacts, these lenses are custom-made for each wearer's eyes. 1-800-GET-LENS ® - Gas Permeable Contacts - LOWEST PRICE GUARANTEE on all Gas Permeable contact lenses. Toric contact lenses are available in both soft and rigid gas permeable (RGP or GP. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. (Contact your Authorized Boston ® Manufacturer for further details). ClearKone-Synergeyes or rigid gas-permeable contact lens in keratoconic patients: a clinical decision. 3. Clean your contact lenses and case. Then I went into soft lenses, but the dry eyes bothered me a little, so I went into GP lenses. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. Soft Contact Lenses. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. Simply soaking the lenses for 30 minutes will ensure the removal of deposits. The SynergEyes GP ll lens is an innovative corneal gas permeable contact lens with two innovations: 1) a linear landing zone and 2) a unique tear reservoir. Contact lenses also increase the risk of eye damage because bacteria and. Please note that non-sphere lenses are priced at $94. Eye Contact Lens. These two factors decrease the risk of eye problems with gas permeable lenses, compared with wearing soft contacts. The proof is in the numbers. Extended Wear Contact Lenses. Scleral lenses rarely become cloudy, unless due to a. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. Gas Permeable (GP) contact lenses have many benefits and are often better than soft lenses because. These lenses, called corneo-scleral lenses, generally are approximately 13 to 15 mm in diameter. Hashemi H, Shaygan N, Asgari S, et al. Do not use soaps that contain lotion, cream, perfume, or artificial coloring. A Look at the Numbers. Gas permeable contacts last longer. Romero-Rangel T, Stavrou P, Cotter J, et al. The GP ll. RGP lenses are permeable so that they can allow. Contact lenses Gas-permeable lenses. 1 Diagram demonstrating that base curve radius is the difference between real image and aerial image. Contacts For Hard-To-Fit Eyes. Contact lenses rest directly on your eyes buoyed by the tear film. Silicone hydrogel contact lenses are advanced contacts that may be healthier than regular soft lenses. Gas Permeable (GP) contact lenses have many benefits and are often better than soft lenses because. With contact lens wear, 83. Call Us! 512-258-2020. While each provides its own unique. Their ability to transmit oxygen reduces eye problems such as dry eyes caused by reduced oxygen that are common in many brands of soft lenses or hard (non-GP) lenses. Contact lenses can cost anywhere from $150 to $1,500 a year, depending on the brand, type, and your. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. GP lenses are increasingly relegated to patients with complex prescriptions or high vision demands, and specialty designs such as custom soft toric, hybrid and scleral lenses are now. 8 This shows that selecting or changing lenses based on BC alone may not be most appropriate as sagittal height. Introduction to Gas Permeable Materials Overview Advances in diagnostic technology have provided information that corneal structure and function is adversely affected over time if not supplied with adequate oxygen. Soft contact lenses can correct nearsightedness (myopia), farsightedness (hyperopia), blurred vision (astigmatism), and age-related loss of close-up vision (presbyopia). Received in revised form October 01, 2019. This increases comfort and maintains eye health. ESSential Multifocal GP lenses utilize an alignment fitting philosophy that ensures long-term corneal integrity and. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. How do I put in gas permeable contacts? When putting in gp lenses, follow these steps: 1. The hard, oxygen-permeable material lets the eye breathe and significantly reduces the chance of infection due to protein deposits which tend to harbour bacteria on soft lenses. Disposable (Replacement Schedule) Contact Lenses. The increased oxygen supply to the cornea will enhance corneal sensitivity that may have been lost due to a lack of oxygen availability through the PMMA material. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. 1 Diagram demonstrating that base curve radius is the difference between real image and aerial image. For mild to moderate keratoconus, scleral contact lenses made of advanced rigid gas permeable lens materials typically are the treatment of choice. CLEAR CARE PLUS (CCP), also known as AOSEPT PLUS with HydraGlyde, is approved for use with gas permeable (GP) lenses, and the indication is supported by the scientific evidence that is reviewed in this article. 75 or more astigmatism • You must evaluate lens rotation • Markings are typically at 6:00 Remember LARS • Left add; right subtract from the SPECTACLE refraction • Each clock hour is approximately 30 degrees • Let’s do an example. Before the introduction of soft lenses. ROSE K lenses incorporating ACT are designed to accommodate this asymmetry (good edge lift at 3, 9 and 12 o'clock but lift at 6 o'clock). 2:00 PM - 6:00 PM. 1. was educated as to the likelihood that even a small mislocation off axis with a high-powered soft toric would lead to visual fluctuation and/or outright blurring, despite the advantages of better initial comfort compared to GP lenses. Fits up to 95% of all contact lens candidates. Gas permeable (GP) contact lenses are more rigid than soft contact lenses but get stuck similarly. All of these terms refer to the same kind of lens. 0000000000000988. They’re generally considered the most comfortable type of contact lens. Soft contact lenses have their disadvantages too, including a higher rate of infection and less durability than gas. Gas Permeable Inferior Decentration: Terry R. When properly fitted, these lenses can provide great vision at all distances. Scleral lenses rarely become cloudy, unless due to a. It can be managed by surgical and non-surgical means, rigid gas permeable (RGP) contact lens as its main non-surgical method is widely used in clinic. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. Fluid-ventilated, gas-permeable scleral contact lens is an effective option for managing severe ocular surface disease and many corneal disorders that would otherwise require penetrating keratoplasty. 0 mm in diameter, fitting better in small central or mild cones . Hybrid and gas permeable lenses require more time and expertise to get a precise fitting, so factor that into your buying decisions. Medical applications of scleral contact lenses: 1. Standard Gas Permeable (GP) contact lenses and Scleral contact lenses are the treatment option of choice for keratoconus because they help contain the shape of the cornea to prevent further bulging of the cornea. 3 Toric Soft Contact Lenses; 3. The concentric stock zone parameter is typically configured in a 1. Although you can break them (for instance, if. (405) 341-2062. Scleral lenses usually last for up to 3 years, but as with all types of. Contact our team of specialty contact lens consultants to learn about. REDWOOD CITY, Calif. While not as popular as soft contact lenses, gas permeable lenses, or hard contacts, do have their advantages. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. The GP lenses are. Rigid gas permeable lenses (also called RGP or GP lenses) usually can be prescribed successfully. In optometry school, we learn the basic fitting principles of both soft and gas permeable (GP) lenses. 38 mm. View all Topics. Silicone hydrogel contact lenses: A complete guide. Clear Care is a convenient and highly effective hydrogen peroxide based system for simultaneous cleaning, daily protein removal and disinfecting of soft (hydrophilic) and rigid gas permeable lenses as recommended by. Menicon Progent is a highly effective deposit and protein remover compatible with all GP contact lenses. Eye doctor listings provide address and phone number and, if available, website or email address. Keratoconus is a progressive disease, which has a great impact on patients' quality of life and mental health. Gas permeable contact lenses (also called GP or RGP contacts) are an alternative to soft lenses. The use of rigid gas permeable contact lenses in scarred corneas. Cornea. These patients represent a tremendous opportunity for us to look beyond the soft lens fitting sets in our offices to find a customized and highly satisfying vision solution: gas permeable (GP) multifocal lenses. 3. Contacts can be either soft or gas permeable (GP). You can also order GP lenses empirically, by giving the topographies, keratometric values, pupil sizes, iris diameters, lid positions, fissure heights and refractions to a lab. It offers the optics of a GP lens with the comfort of a soft contact lens. Boston Advance Conditioning Solution contains a patented comfort system that coats and cushions GP contact lenses for exceptional lens comfort. The soft material in these shoes acts as an air channel, allowing oxygen to freely flow throughout your cornea, making them more comfortable and healthier. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. 919-213-6490. Advantages of Gas Permeable Lenses. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. The Comfort Issue. 115. There are many types of contact lenses. As opposed to soft silicone hydrogel contact lenses, GP lenses retain their shape better, giving them more a “rigid” feel during wear while still allowing oxygen to pass through the. There are two categories of contact lenses based on. Gas permeable contact lenses, also known as GP or rigid gas permeable (RGP) lenses, are severely underrated. 00mm diameters or less fit well into the Clear Care lens basket. . Gas permeable contact lenses offer some impressive benefits over soft lenses. According to the Amsler–Krumeich classifications, we included 18 eyes in stage 1, 35 eyes in stage 2, and 28 eyes in stage 3. To access addresses, phone number, etc. Call Dr. 29 and 0. It can take up to four weeks to get used to wearing gas permeable lenses. Office: 781-251-2222 | Optical 781-234-0275. Soft contacts are great at. Hard lenses are often interchangeably referred to as rigid gas-permeable lenses (RGPs); however, this is not strictly true. If you have astigmatism – a common condition where the eye isn’t perfectly round, but more football- or egg-shaped – then you’ll need a special design of contact lenses called “toric” lenses for clear vision. The distance and near zones are separated by a visible line in the lenses. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. Fitting sets and inventories; loaner fitting sets are often available. Rigid Gas Permeable (RGP) Contact Lenses. Well known for their exceptional visual performance, GP lenses, also referred to as gas permeable or rigid gas permeable (RGP) lenses, are often not immediately associated with enhanced safety. Abstract. Shop contact lenses. Contact lenses have been used, primarily to neutralize refractive errors, for more than 100 years, but they have achieved reasonable clinical. These designs are usually lighter than other prism ballast designs and available in many different gas permeable materials. Fitting hybrid contact lenses — like fitting gas permeable contacts — takes more time and expertise than fitting soft contact lenses. It can take up to. Bennett, E. Nonetheless, most practitioners consider gas permeable (GP) lenses the standard of care for rehabilitating vision due to irregular astigmatism. Many types of lenses can be used in the management of patients who have undergone corneal transplantation (ranging from full-thickness keratoplasty to anterior and posterior lamellar keratoplasties), including custom soft lenses, corneal gas permeable (GP) lenses, hybrid lenses. Contacts For Hard-To-Fit Eyes. Gas permeable (GP) contact lenses, also known as rigid gas permeable (RGP) lenses, are hard contact lenses made of silicone-containing compounds that allow oxygen to pass through the lens material to the. Call (703) 417-9316 to learn more. 2. 99. A. A selection of brands including Acuvue, Clariti, Bioinfinity, Proclear and Air Optix are available online. We also proudly offer our in house multifocal design (High. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. • If the near segment is too low, order a new lens with a. However, they are more costly than GP lenses as well. Though costs are initially higher than traditional contact lenses, in the long term they are more cost-effective, and unlike disposable lenses, they don’t require ongoing replacement. Triple Action Cleaning – Deep Cleans, Loosens Dirt, Enhanced Protein Removal. Abdalla YF, Elsahn AF, Hammersmith KM,. 00 D. Concentric bifocal lenses can be made of either soft or rigid gas permeable (RGP or GP) contact lens materials. PMMA lenses were commonly prescribed years ago, but essentially have been replaced by gas permeable lenses. Most people with average prescriptions should be able to get a year’s worth of contact lenses for $200 to $500. . Gas-Permeable Lenses for Aphakia Gas-permeable (“GP”) lenses have great oxygen transmissibility and also offer more customizable steps in refractive power and fitting parameters GP lenses must also be taken out at night as they are not approved for extended wear H owever, GP lenses, if fit properly, can offer excellent potential for visual. Your contact will be uncomfortable and won’t provide clear vision. Nutrifill is a unique physiologic formula that, in addition to sodium, contains calcium, magnesium. We also know that GP lenses tend to center over the steepest apex of the cornea. [1,2,3,4,5] Fitting of GP lenses in keratoconus patients and achieving an acceptable fit can be considered challenging for eye care. Those were made of PMMA (polymethyl methacrylate) , a type of plastic that, while lightweight and effective at correcting vision, did not allow oxygen. They offer excellent eye health: because they don’t contain water like soft lenses do, they resist deposits and are less likely than soft contacts to harbour bacteria. 0 to 9. These lenses are made of a variety of rigid plastic materials that are oxygen permeable. Approved for all Soft & RGP Contact Lenses. The GP contact lenses were 9. However, in certain cases gas permeable (GP) lenses can be used for therapeutic purposes, especially in cases of corneal irregularity. . ABOUT US. Maller is in private solo practice in Fort Lauderdale, FL. In many ways they are similar to hard lenses but are porous to oxygen. Here, alternating between a daily GP lens cleaner and an extra strength or alcohol-based daily cleaner could be helpful. Dry eye syndrome is one of the most common problems affecting contact lens wear. SynergEyes Gas Permeable Contact Lenses. Follow these steps to safely remove a gas permeable. Manufacturers quote the wetting angle of a given material as measured at 7 days after soaking. Introduction. Disadvantages of Gas Permeable Contact Lenses. An irregular corneal surface does not allow for optimum vision. Effect of large diameter and plasma coating on the initial adaptation of gas permeable contact lens fitting for neophytes. Scheid, OD, FAAO Background EA was a long-term rigid corneal contact lens wearer referred due to visual and discomfort problems with her current two year old gas permeable (GP) lenses. Here, well look at specific situations in which GP lenses can help correct corneal irregularity. The pre-lens tear film consists of the outer lipid layer of the tear film and a portion of the aqueous and mucin mixture. But generally, most surgeons say you should stop wearing soft contact lenses at least two weeks prior to surgery. Boston Simplus - a one-bottle lens care system that not only cleans, disinfects and conditions gas permeable (GP) contact lenses,… Read more. CLAO J. 1. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. 5mm to 25mm in diameter. Hybrid. Figure 2 shows the coding for this case. Boston Conditioning Solution – Improved Formula + More Details - Less Details. They have proven to become a very successful replacement for hard lenses (PMMA). GP lens wearers who present with dry eyes can usually be easily managed once we as practitioners determine the cause of the dryness. B. 04mm decreases the equivalent oxygen percentage. For GP lenses, Clear Care’s indication includes a digital rubbing step. TruForm was established in 1976 by one of the true pioneers of contact lens machining, Frank Svochak, Sr. Boston Advance Conditioning Solution. The elevation maps are created based on a reference surface that is placed on the eye, like a spherical GP would be placed on the eye. Dry your hands with a clean, lint-free towel. GP lenses are currently less popular than soft lenses but offer a number of advantages and are continuing to improve as research and technology advance. An eye care specialist can help you decide which type is best for you. In the United Kingdom, Pullum et al. Gas Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses that are made from a hard, oxygen permeable material. “Think about other options. Contact lenses that do not fit. Scleral lenses with 16. Hard lenses are often interchangeably referred to as rigid gas-permeable lenses (RGPs); however, this is not strictly true. Call Us! 512-258-2020. If fitting a 15mm lens, 2,000µm—the average sagittal height for most eye types from a chord length of 10mm to 15mm—will need to be added. Gas-Permeable (GP) or Rigid Gas Permeable (RGP) contact lenses are an alternative to soft contact lenses and are made from a hard, oxygen-permeable material. Rigid gas permeable (RGP) are also known as ‘hard’ contact lenses are also used for the correction of astigmatism.