|
International Newsletter and Forum on Rigid Gas Permeable Contact Lenses, Corneal Shape, Health and Vision |
|
|
|
|
|
|
Rob Breece
 A month ago, the day the last issue of I-site was published, a good friend to the (R)GP lens industry unexpectedly passed away. One of the items in the August issue of I-site discussed scleral lenses. For over 10 years, Rob Breece advocated and predicted the potential of this lens design, and he created his own semi-scleral lens design. And he was right. Rob also fitted many, many patients with scleral lenses in his practice in Front Royal (Virginia), near Washington DC (USA). The entries in the online guest registry by some of his patients are heartbreaking. He really changed some people's lives. Rob - you will be missed.
Eef van der Worp |
3- and 9-o'clock staining |
|
Not the 9 o'clock news...
While corneal desiccation in soft lens wear gets a lot of attention in the international literature, corneal desiccation in (R)GP lens wear is poorly covered. It does deserve some attention though, since it is a common finding amongst (R)GP lens wearers and appears regularly in our chairs. A complete thesis on the topic can be downloaded that explores the phenomenon and discusses some possible answers and management options, as well as a specially designed grading scale for the condition. For those of you that don't want to go through its 200 pages - thank goodness there is a summary (in English and in Dutch) in the back. |
It's a cone!
 In the current (September) issue of the Journal of Cataract and Refractive Surgery, a study by Li et al covers the early detection of keratoconus, which is obviously of extreme importance to the refractive surgeon. Prior to the study they selected four groups: keratoconus, early keratoconus, keratoconus suspect, or normal based on clinical signs and videokeratography. Subjects were followed for one to eight years. Over a median follow-up of 4.1 years, approximately 28% in the keratoconus-suspect group progressed to early keratoconus or to keratoconus, and 75% in the early keratoconus group progressed to keratoconus. Central keratometry, inferior-superior differences in topography and the KISA index were significantly different among groups. Also, progression of keratoconus varied among the groups. |
Scleral lens fit based on OCT data
 A 53 year old female presented recently for a scleral lens fitting on the right eye only. Her history is significant for bilateral radial keratotomy. She subsequently she underwent LASIK surgery and then Intacs implantation on the right eye. Her unaided visual acuity was 20/100- OD. Several anterior segment scans were taken of the right eye using an Optical Coherence Tomographer (OCT). Image analysis tools were then used to construct the proposed scleral lens design over the composite image. After the digital lens fitting, the lens was dispensed the very next day, resulting in a visual acuity of 20/25. No modifications were necessary. See this month's case report by Greg Gemoulis (Texas, USA) for full coverage of this advanced 18mm (semi-) scleral lens fit. |
On PAR
A golf ball pattern impression on the cornea (dimple veiling) caused by gas bubbles beneath an orthokeratology lens. Pooling of fluorescein will be visible once the lens is removed, but will disappear rapidly when the fluorescein is flushed out of the eye. It therefore does not represent 'true' corneal staining as caused by damaged epithelial cells, but vision can temporarily be affected. Photo: Javier Gonzalez-Cavada (Spain)
| |
|
|
|
|
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-politcal. Its editor Eef van der Worp is a lecturer and a consultant for a varity of industry partners, but is not related to any specific company. Please contact us at: i-site@netherlens.com. | |
|