Optics R&D Services
Optics R&D Services
Optics R&D Services
R&D relating to the design, fabrication, and testing of plastic lenses, particularly
- Intraocular Lenses (IOLs)
- IOL Optics
- Contact lenses
- Diffractive lenses
- Extended depth of focus (EDF) lenses
- Toric lenses
- Zemax calculations
- Ophthalmic optics
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Original Research
Optics R&D Services
Optics R&D Services
"Negative Dysphotopsia" is where some patients with intraocular lenses (IOLs) see bothersome "dark shadows" in the far periphery. This is probably due to vignetting at the IOL. See Dysphotopsia, Publications, and Downloads.
The limit of vision in all directions is rarely measured, including "Far Peripheral Vision", and calculations indicate that this is reduced with an IOL. These limits should be evaluated, and compared in particular to the level of myopia, because we use the entire visual field, and other factors than defocus may affect eye growth.
The "Nodal Point" can linearly scale the retinal image to very large angles, but this is due to the highly curved cornea and retina, and the iris location, rather than to "paraxial" concepts (which are defined using flat surfaces and very small angles).
The EFL or "effective focal length" or "equivalent focal length" are all the same thing for a lens in air, but for the eye the nodal point is at f'/n'.
[Papers in preparation from "Visual and Physiological Optics" Conference, Wroclaw, Poland, August 28-30 2024:
Double Images in the Far Periphery with Intraocular Lenses
Reduction of both Axial Length and Myopia by an Orbital Tumor]
About Us
Optics R&D Services
About Us
Michael J. Simpson, Ph.D.
Dr Simpson worked in industry for over 25 years in the Research and Development of Intraocular Lenses (IOLs), and is continuing to support R&D work relating to ophthalmic lenses and other topics.
New Paper for 2025 !!!
Michael J. Simpson, Damien Gatinel, Miguel Faria-Ribeiro, Xin Wei, Geunyoung Yoon, Junzhong Liang, Pablo Artal, Susana Marcos, "Design concepts for advanced-technology intraocular lenses [Invited]," Biomed. Opt. Express 16, 334 (2025) . https://doi.org/10.1364/BOE.544647
Simpson MJ, "Optical modeling of the entire visual field of the eye," J. Opt. Soc. Am. A 40, D7 (2023) https://doi.org/10.1364/JOSAA.488033
Simpson MJ. "Focal Length, EFL, and the Eye". Applied Optics, v62, n7, 1 Mar. 2023 p1853-1857.
https://doi.org/10.1364/AO.481805
Simpson MJ, "Nodal points and the eye," Appl. Opt. 61, 2797-2804 (2022) https://doi.org/10.1364/AO.455464
