Glare reducing rough surfaces
View Patent ↗An intraocular lens for insertion into a capsular bag in order to focus incoming light toward a retina and process for manufacturing thereof along with concomitant reduced glare and improved vision provides for a center lens portion of a lens for focusing incoming light toward the retina and the surrounding lens portion for mounting the lens within the capsular bag. A surface roughness disposed on the surrounding lens portion is provided for reducing the glare due to non-focused light directed toward the retina from the intraocular lens with the roughness having a roughness level of between about Ra 45 and about Ra 350.
1. A process of fabricating an intraocular lens (IOL), the process comprising:
providing a blank lens having a center lens optical portion, a surrounding lens portion, and at least one haptic coupled to the surrounding lens portion,
wherein the center lens optical portion focuses incoming light toward the retina of an eye, and the surrounding lens portion has an anterior surface, a posterior surface, and a peripheral edge surface, said peripheral edge surface intersecting at least one of said anterior and posterior surfaces;
roughening the peripheral edge surface such that the peripheral edge surface has a glare-reducing rough surface with a surface roughness level of about Ra 180 μ in; the rough surface having a Gaussian distribution width sigma of at least 1 when illuminated by an incident light beam, and scattering data from the illuminated rough surface is fitted to a Gaussian distribution model, the incident light beam having a wavelength of 633 nanometers and illuminating the surface at a 55 degree incident light angle; and
wherein the center lens optical portion has no surface roughening applied thereto.
2. The process according to claim 1 wherein selected portions of the surrounding lens portion are roughened.
3. The process according to claim 1 wherein roughening the surrounding lens portion comprises roughening a selected area by Electrical Discharge Machining.
4. The process according to claim 3 wherein the roughening of the surrounding lens portion further comprises controlling the Electrical Discharge Machining through a program as set forth in Table 1.