Effect of a 7.0 mm intraocular lens optic on peripheral retinal illumination with implications for negative dysphotopsia
| Autor: | Jay C. Erie, Michael J. Simpson, Michael A. Mahr |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Optics and Photonics
Materials science genetic structures medicine.medical_treatment Intraocular lens Retina Pupil chemistry.chemical_compound Optics medicine Humans Negative dysphotopsia Lighting Lenses Intraocular business.industry Retinal eye diseases Sensory Systems Peripheral Ophthalmology medicine.anatomical_structure chemistry Surgery sense organs Visual Fields Visual angle business Refractive index |
| Zdroj: | Journal of Cataract and Refractive Surgery. 48:95-99 |
| ISSN: | 1873-4502 0886-3350 |
| DOI: | 10.1097/j.jcrs.0000000000000822 |
| Popis: | To use optical modeling to compare a 6.0 mm and 7.0 mm intraocular lens (IOL) optic diameters on peripheral retinal illumination with implications for negative dysphotopsia.Mayo Clinic, Rochester, Minnesota, and Simpson Optics LLC, Arlington, Texas.Model eye.Ray-tracing software was used to simulate retinal illumination from an extended light source for a pseudophakic eye with in-the-bag biconvex IOLs (refractive index [n] = 1.46 and 1.55) and a 2.5 mm pupil. Ray-tracing diagrams and simulated retina illumination profiles were compared using the 6.0 mm and 7.0 mm optic diameter IOLs. Retinal locations were scaled to relative visual angles from 70 to 110 degrees horizontally.A 7.0 mm optic (n = 1.46) expands the image field by 2.8 degrees compared with a 6.0 mm optic. High-angle input light misses a 7.0 mm optic at a larger visual angle than a 6.0 mm optic, shifting illumination of the peripheral retina by this light anteriorly by 5.6 degrees. Consequently, a region of nonilluminated peripheral nasal retina is enlarged and shifted peripherally using a 7.0 mm optic (visual angle, 86.3 to 96.3 degrees) compared with a 6.0 mm optic (visual angle, 83.5 to 90.7 degrees). Similar illumination changes were seen modeling a 1.55 n IOL.A narrow dark region in the nasal retina when using a 6.0 mm optic is changed to a broader, more peripheral dark region when using a 7.0 mm optic. An extended, more peripheral dark nasal region may make a temporal shadow less bothersome and explain lower negative dysphotopsia rates using a 7.0 mm optic. |
| Databáze: | OpenAIRE |
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