search information related to IOL, biometry, corneal topography, etc.

Since the launch of the RayOne Galaxy lens, there has been a significant amount of attention focused on spiral optics and how such design provides multiple focal points to provide depth of vision to patients. The adoption of spiral optics to provide such multifocality in IOLs or contact lenses is new, and not many literature is available that would help a layman like myself, to comprehend. So here I set out to reflect what I have understood whatever reading material is availa

This is a video explanation on negative dysphotopsia, its causes, symptoms, and treatment options.

Adapted from the JCRS https://doi.org/10.1097/j.jcrs.0000000000001502

A case study detailing how to avoid a bad outcome by looking into the IOL calculation or biometry page throughly

Recently, Filomena and co-authors ( https://doi.org/10.1097/j.jcrs.0000000000001502 ) presented evidence based scientific classification of partial and full range vision lenses. Based on their classification, I could summarize the following: a) IOLs that provide more than 2.3 diopter of pseudo-accommodation at .2 log mar (6/9.5 or 20/32) in the defocus curve can be classified as full range of vision IOLs b) IOLs that provide less than 2.3 diopter of pseudo-accommodation at

The following video content is an impression of how the Barrett Universal II formula works. Barrett Universal II is an unpublished...

This calculator will help you to calculate the power of cornea from the radius of curvature

A common notion amongst clinicians is that the labelled power (diopter) on the IOL box is precisely the power of the IOL. That is, the...

Objective: This tool helps you to find following things: What is the true size of the diameter of the central bull's eye of the diffractive multifocal IOL Where is the light passing through the bull's eye dedicated to How to Use: A. Enter the add power of the diffractive IOL B. Enter the wavelength of light ( usually 550 or 555 nm of light is the industry standard) Example: A diffractive multifocal IOL of 3.75 add power claiming its central bull's eye zone to be .769 should d