I presented a course entitled “GP Update” and the following includes some of the information provided in this course which included updates on current trends in GP lenses, including myopia management, sclerals, multifocals, torics, irregular cornea, and spherical lenses.
=====I. Current Status
==========a. 11% of contact lens fits and refits in the ===============US are GPs.(1)
==========b. Of the breakdown of GP lenses by ===============category (2);
===== i. Conventional Spherical: 46%
===== ii. Sclerals: 27%
===== iii. Corneal Reshaping: 11%
====== iv. Multifocals: 10.5%
===== v. Torics: 10.5%
===== vi. Hybrids: 7%
==========c. Biggest Advancements in GP Lenses in ===============2020 (per survey of the GPLI ===============Advisory Board)
===== i. Introduction of stable, wettable, 200 ===============Dk materials
===== ii. Profilometry/topography-driven scleral ===============designs
===== iii. Custom back surface scleral designs ===============(toric haptics, quad-specific)
===== iv. New GP disinfection guidelines (3); ===============also available for download from ===============www.gpli.info (under “Resources” and ===============then “Order Printed Materials”)
===== v. New orthokeratology lens designs
=====II. Overnight Orthokeratology
==========a. Empirical fitting has demonstrated very ===============good (80%)(4) first-fit success
==========b. Due to the larger diameter, limited ===============movement, low edge clearance ===============design, and overnight wear schedule, ===============adaptation can occur within a few ===============nights.
==========c. Online certification is straightforward and ===============not difficult
==========d. The incidence of microbial keratitis is no ===============greater than with conventional ===============extended wear (5)
==========e. An excellence overview article was ===============recently published by Drs. Mark ===============Bullimore and Leah Johnson.(6)
==========f. A great consumer resource is the new ===============Myopia Management brochure ===============available from the GPLI.
=====III. Lens Materials, Coatings, Design, and Fitting
==========a. Improvements in oxygen permeability, ===============surface wettability, greater flexural ===============resistance, better memory/less ===============warpage, and scratch resistance are ===============characteristic of current materials ===============versus their predecessors.
==========b. The “New Kid on the Block” is Acuity 200, ===============a 200 Dk material from Acuity ===============Polymers
==========c. Available for shipment this week is the ===============long-awaited Tangible Boost ===============solution. This is a conditioning ===============solution designed to restore the ===============Tangible Hydra-PEG layer on the ===============lens surface. It is a five-step monthly ===============process to be performed by the ===============patient. It is a prescription only ===============product that can be sold directly by ===============eye care practitioners or via contact ===============lens laboratories. At this time --===============laboratories that can fulfill orders ===============include X-Cel, ABB, AccuLens, AVT, ===============and Valley Contax.
==========d. With the advancements in GP lens ===============manufacturing including consistent ===============edges, ultrathin design, and standard ===============peripheral systems, empirical fitting ===============of almost all corneal GP lenses ===============(except fitting of the irregular cornea) ===============is encouraged as patients experience ===============the “Wow” factor with vision upon ===============application. A recent survey found ===============that about 79% of practitioners fit ===============bitoric lenses empirically, followed by ===============multifocals (75%), spherical (69.5%), ===============and corneal reshaping (58%).(2)
=====IV. Scleral Lenses
==========a. The SCOPE study has found that 74.2% ===============of scleral fits are to irregular cornea ===============patients, 16.1% to ocular surface ===============disease patients, and 9.7% to healthy ===============eyes (i.e., astigmatism, ===============presbyopia).(7)
==========b. When the Contact Lens Spectrum ===============readership was recently surveyed as ===============to which contact lens option they fit to ===============irregular cornea patients, the “Go To” ===============lens was sclerals.(2) 52% of ===============respondents fit ≥ 50% of their ===============patients into sclerals followed by 18% ===============for small diameter GPs, 10% for ===============intralimbals, 5% for hybrids, and 4% ===============custom soft.
==========c. In the September “scleral” issue of ===============Optometry and Vision Science ===============(OVS), Dr. Dan Fuller reported on the ===============safety of scleral lenses.(8) In a ===============sample size of 157, there was a total ===============of 9.6% adverse events with only a ===============few of those being significant ===============complications. It was concluded that ===============overall scleral lens wear is quite safe. ===============In addition to September OVS, both ===============the November, 2020 issue of Eye & ===============Contact Lens and the December, ===============2020 issue of Contact Lens & ===============Anterior Eye were devoted to scleral ===============lens research.
==========d. It is also very evident that the emergence ===============of scleral lens use has greatly ===============impacted the need for a corneal ===============transplant. In the January, 2021 issue ===============of Cornea, with a sample size of ===============2806 eyes with keratoconus or other ===============ectasia, it was concluded that ===============patients who wore scleral or corneal ===============GP lenses had almost one-fifth the ===============risk of undergoing keratoplasty.(9)
==========e. There are a number of very good scleral ===============lens resources included 27 archived ===============webinars, and a Scleral Lens ===============Troubleshooting FAQs online mini-===============book (in conjunction with the Scleral ===============Lens Education Society (SLS), the ===============SLS and it’s ongoing workshops and ===============webinars, Eef van der Worp’s “A ===============Guide to Scleral Lens Fitting” ===============(available online from Pacific ===============University), the Scleral Lens Fit ===============Scales (available from the Michigan ===============College of Optometry), the text ===============“Contemporary Scleral Lenses” by ===============Melissa Barnett and Lynette Johns, ===============and a wonderful comprehensive ===============“Scleral Lens Primer” article co-===============authored by four members of the ===============GPLI Advisory Board and available ===============online in the October, 2020 issue of ===============Contact Lens Spectrum.(10)
References:
1. Nichols JJ, Fisher D. Contact Lenses 2020. Contact Lens Spectrum 2021;36(1):24-29.51.
2. Bennett ES. GP Annual Report 2020. Contact Lens Spectrum 2020;35(10):28-30,32,34,36,37,59.
3. Sindt C, Bennett E, Szczotka-Flynn L, Sclafani L, Barnett M. Technical Report: Guidelines for =====Handling of Multipatient Contact lenses in the Clinical Setting. Optometry and Vision Science =====2020;97(8):544-548.
4. Davis RI, Eiden SB, Bennett ES, et al. Stabilizing myopia by accelerating reshaping technique =====SMART) study three year outcomes and overview. Advances in Ophthalmology & Visual System =====2015;2(3).
5. Bullimore MA, Jordan LA. The Risk of Microbial Keratitis with Overnight Corneal Reshaping Lenses. =====Optometry and Vision Science 2013;90(9):937-944.
6. Bullimore MA, Johnson LA. Overnight Orthokeratology. Contact lens and Anterior Eye 2020;43:322-=====332.
7. Schornack M. The SCOPE Study: An Overview. Contact Lens Spectrum 2017;32(12): 25-28,30,32.
8. Fuller DG, Wang Y. Safety and Efficacy of Scleral Lenses for Keratoconus. Optometry and Vision =====Science 2020;97(9):741-748.
9. Ling J, Mian SI, Stein JD, et al. Impact of Scleral Contact Lens Use on the Rate of Corneal =====Transplantation for Keratoconus. Cornea 2021;40(1):39-42.
10. Jedlicka J, Mazza B, Fuller D, Lee K, Bennett E. Scleral Lens Primer. Contact ens Spectrum =====2020;35(10):E1 – E9.