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International Newsletter and Forum on Rigid Gas Permeable Contact Lenses, Corneal Shape, Health and Vision |
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Secret Garden
 The contact lens industry is an interesting one. It looks like a small world, and in many ways it is. But as our beautiful profession is so diverse and has so many aspects to it, you keep meeting new people and discovering new 'alleys' with hidden doorways and courtyards - especially in the specialty lens field - surrounded by the giant skyscrapers that tower high above them (the multinationals). You can see the (R)GP and specialty lens business almost as a secret garden. It is not easy to find, but once you are in it - you are surrounded by a friendly atmosphere and unexpected and unprecedented camaraderie, even though many visitors are competitors. I am eternally grateful to be part of the secret garden club. Just don't tell too many people about it. It may get crowded.
Eef van der Worp
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International (R)GP Contact Lens Prescribing
Based on the yearly Eurolens research international survey on contact lens fits, the (R)GP lens profession has a pretty bright outlook. The paper, published in the January issue of Contact Lens Spectrum, states that 10% of lens fits around the world are with (R)GPs, which hence maintained their recent level. (R)GPs account for 18% or more of lens fits in France (17%), New Zealand (18%), Japan (19%), the Netherlands (26%) and Slovenia (28%). In Australia, Italy, the Netherlands and Taiwan, 5% or more of all lens fits are with orthokeratology (9% in Taiwan). For the first time in the history of this survey, 'anti-myopia' as a lens design category was included in 2011 to capture lens fits specifically designed for the control of myopia. Five percent of lens fits were afforded this designation - most of it devoted to (R)GP lenses.
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(R)GP In Office Disinfection
Contact lens care and disinfection receives a lot of attention in our media. However, (R)GP lens disinfection gets limited coverage. In a special edition of Contact Lens Spectrum focused on lens care, Greg DeNaeyer looks at (R)GP Lens Care Options and states that the success of (R)GP lens patients depends on lenses that provide good vision and comfortable wear; these provisions are directly dependent on lens care. Lens care in (R)GP lens fitting should not be an afterthought, he states. Michael Ward in the September issue of Contact Lens Spectrum looked specifically at In-Office-Care-and-Disinfection of (R)GP Diagnostic Lenses. He recommends storing rigid diagnostic lenses dry for long-term storage. To do so, clean manually and then disinfect the lenses with an approved peroxide system for a minimum of 10 minutes. Prior to reuse, clean the diagnostic lenses with an approved cleaner, then rinse and wet them with an appropriate wetting or conditioning solution.
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Corneal Morphology Changes in Orthokeratology
Amelia Nieto-Bonain and colleagues in Spain assessed the long-term morphological and biometric corneal changes produced by overnight orthokeratology and examined their recovery after cessation of contact lens wear. No significant changes in endothelial cell density were observed over time, but polymegethism increased significantly. The numbers of activated keratocytes increased during the study and then returned to baseline when lens wear was ceased. Perhaps less of a surprise, epithelial changes were found as well - these changes also returned to baseline after lens cessation. The decrease in epithelium thickness reached statistical significance. The authors concluded that overnight orthokeratology induces structural and optical changes to the cornea and, if confirmed, the irreversible changes detected indicate a need for further investigation.
Current Eye Research, October 2011
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Indications
Scleral lenses are another tool in your contact lens toolbox, but their application is far more reaching than simply for patients who have compromised corneas." This is the start of a five-case-report illustrated article in Contact Lens Spectrum by Jason Jedlicka, Marsha Malooley and Renee Reeder. The indications in this article are not the traditional 'extreme makeover' corneas - they range from a return to (R)GP lenses after soft torics failed in one patient to dry eye and comfort issues in others or indications like significant refractive error. In the latest Scleral Lens Society Newsletter, Muriel Schornack reports on an interesting case of a non-healing epithelial defect in a 56-year-old Caucasian male (see photo with this item). One month after initiating scleral lens therapy, the epithelial defect had resolved completely.
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Progression of PMD underneath a Scleral Lens
Progression of ectasia in keratoconus and pellucid marginal degeneration (PMD) is well known to (R)GP corneal lens specialists. Common complaints include contact lens instability, lens intolerance and discomfort. A patient fit with a scleral lens may experience little or no symptoms of advancing ectasia because the device vaults the cornea until there is contact. In this case report, a 44-year-old man with a history of PMD OU wearing scleral devices from the Boston Foundation for Sight returned after four years, at which time he complained of severe pain OS at the end of wearing time. There was significant corneal contact with the left device, and a 4.5 mm active corneal vessel was extending close to the visual axis OS. To read more: see this link for the full case report by Lynette Johns.
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Upcoming Events
- Global Specialty Lens Symposium, Jan 26-29 2012, Las Vegas USA
- San Diego Specialty Lens Symposium, Febr 24-26, San Diego USA
- NCC 2012, March 10-12, Veldhoven NL
- Asia Orthok and Specialty Lens Conference, March 30-31, Hang Zhou (China)
- Vision by Design, April 19-22, Scottsdale USA
- BCLA meeting, May 24-27, Birmingham UK
- ECLSO congress, September 14-16, Nice FR
- ISCLS congress 2012, September 7-12, Kent UK
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I-site is an educational newsletter that is distributed on a monthly basis and provides an update on rigid gas permeable related topics (scientific research, case reports and other publications worldwide). I-site is objective and non-political. Its editor Eef van der Worp, optometrist, PhD, FAAO, FBCLA, FIACLE, FSLS is a lecturer for a variety of industry partners, but is not related to any specific company. Please contact us at: i-site@netherlens.com.
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