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Subha's Ophthalmic Page
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search information related to IOL, biometry, corneal topography, etc.
Diffractive orders with multifocal IOLs, echelette design and the concept of chromatic aberration correction
standard way of diffractive trifocal IOL manufacturing has been to use the 0 order for distance, & the +1 & +2 orders intermediate & near
Subhabrata Bhattacharya
Mar 8, 2025
Understanding spiral optics designed Rayner Galaxy Intra Ocular Lens
Since the launch of the RayOne Galaxy lens, there has been a significant amount of attention focused on spiral optics and how such design...
Subhabrata Bhattacharya
Mar 1, 2025
Negative Dysphotopsia- Video explanation
This is a video explanation on negative dysphotopsia, its causes, symptoms, and treatment options.
Dr S Navneeth Kumar
Jan 19, 2025
Classification of monofocal, enhanced, and EDOF IOLs based on performance on defocus curve
Adapted from the JCRS https://doi.org/10.1097/j.jcrs.0000000000001502
Subhabrata Bhattacharya
Dec 15, 2024
Biometry case study-Selecting right patient for multifocal IOLs
A case study detailing how to avoid a bad outcome by looking into the IOL calculation or biometry page throughly
Subhabrata Bhattacharya
Dec 8, 2024
How patient axial length, corneal power and effective lens position affect the add power of a multifocal lens
Recently, Filomena and co-authors ( https://doi.org/10.1097/j.jcrs.0000000000001502 ) presented evidence based scientific classification...
Subhabrata Bhattacharya
Nov 27, 2024
Understanding spiral optics designed depth of focus IOLs
Recently a lot of interest has been generated on the concept of spiral optics and multifocal IOLs and contact lenses.
Subhabrata Bhattacharya
Sep 16, 2024
How the Barrett Universal II formula works - impression from a user
The following video content is an impression of how the Barrett Universal II formula works. Barrett Universal II is an unpublished...
Subhabrata Bhattacharya
Jul 27, 2024
Calculator for deriving corneal power with true indices and radius of curvature of anterior and posterior cornea
This calculator will help you to calculate the power of cornea from the radius of curvature
Subhabrata Bhattacharya
Jul 25, 2024
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