Scleral lenses: considerations on the total diameter
https://doi.org/10.33791/2222-4408-2019-4-24-27
Abstract
A scleral contact lens (SCL) can be defined as a lens that only rests on the sclera. Raised from the cornea and limbus, the total diameter must be greater than the horizontal visible iris diameter (HVID) and the extension of the limbus. Currently, the most commonly used lenses are scleral lenses with a diameter between 15.0 and 17.0 mm, the so-called mini-scleral lenses. The existing nomenclature of scleral lenses is based only on HVID and total diameter. It is therefore important to further differentiate smaller minisclera lenses from lager ones.
About the Author
Daddi FadelItaly
Optometrist, lens designer and specialist in contact lenses for irregular cornea, scleral lenses, myopia control and orthokeratology, Founder and President of EALSA; BCLA, ISCLS, FSLS, IKA.
Private practice, 2 Dora St., Rome, 00198, Italy.
References
1. Lupelli L. Optometry A - Z. Dizionario di. Scienza, Tecnica e Clinica della Visione. First Edition. Palermo, Medical Books; 2014.
2. https://www.sclerallens.org/sites/default/files/files/SLS_No-menclature_LtrHead06_26_2013.pdf. Access date 28 May, 2017
3. Van der Worp E., Bornman D., Ferreira D.L., Faria-Ribeiro M., Garcia-Porta N., Gonzalez-Meijome J.M. Modern scleral contact lenses: A review. Cont Lens Anterior Eye. 2014;37:240-250. doi: 10.1016/j.clae.2014.02.002
4. Van der Worp E. A Guide to Scleral Lens Fitting, Version 2.0 [monograph online]. Forest Grove, OR: Pacific University; 2015. Available from: http://commons.pacificu.edu/mono/10/
5. Harthan J., Nau C.B., Barr J., Nau A., Shorter E., Chimato N.T., Hodge D.O., Schornack M.M. Scleral Lens Prescription and Management Practices: The SCOPE Study. Eye Contact Lens. 2017, Apr 6. [Epub ahead of print]. doi: 10.1097/ICL.0000000000000387
6. Bergmanson J.P.G. Clinical ocular anatomy and physiology. Houston, Texas Eye Research and Technology Center, 2010. 111 p.
7. Fadel D., Barnett M. Scleral lenses: prepare for landing. Contact Lens Spectrum. 2017;32:42-43-55.
8. Pullum K. Scleral contact lenses: indications and current clinical methods. Optometry Today. 2006; Oct. 20:26-32.
9. Fadel D. Modern scleral lenses: mini versus large. Cont Lens Anterior Eye. 2017;40:200-207. http://dx.doi.org/10.1016/j.clae.2017.04.003.
Review
For citations:
Fadel D. Scleral lenses: considerations on the total diameter. The EYE GLAZ. 2019;21(4 (128)):24-27. (In Russ.) https://doi.org/10.33791/2222-4408-2019-4-24-27
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