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

Have you ever wondered why they say that for every 1 degree of rotation, there is a loss of 3.3% in toric correction at the cornea plane? Why 3.3%, why not 2%, why not 4%. Where on earth does the 3.3 come from? Here is a breakdown of where the number comes from. Although there is some math involved, I will keep it simple and conceptual. To start with, in ophthalmology, 0 degree and 180 degrees are considered as the same meridian. Aligning the Toric IOL at 0 degrees in the eye

Explains how the Toric IOL nomenclature works and how the IOL power is distributed in the IOL optics for a spherical equivalent IOL power of 10 diopters and a Toric model of T4 or T5

If a patient complains about his glass prescription and finds difficult to adjust to cylinder, how can you prescribe modify the prescription

Why do some patients have more residual astigmatism after implantation of a Toric IOL which is seemingly unexplained

https://www.youtube.com/watch?v=6U2tr2Lgwdo&t=42s

https://www.youtube.com/watch?v=7c9xTsMVJFE&t=690s https://www.youtube.com/watch?v=7c9xTsMVJFE&t=690s

https://www.youtube.com/watch?v=1FUUCmq9lAQ&t=221s

The below video is part of a four video series explaining astigmatism and its correction with glasses and Toric IOLs....

This decade has seen many new concepts cropping up with regard to the concept of astigmatic correction with TORIC IOLs. First, Douglas...

When can we choose a TORIC IOL for a fairly irregular cornea. It is critical to look into the central 3 to 4 mm zone of the cornea

When your different keratometry machines give different values of the corneal power of the same patient use the Barrett K calculator.

This article is in continuation to my write up in this blog ‘The Why & What of Centroid SIA involving astigmatism correction’. I would...

As the art of correcting corneal astigmatism became popular with Toric IOLs, a predominant concept has been to provide incision on the...

In this article, I will explain astigmatism and how it is corrected with glasses. To further reference you can also see my video explanations in the TORIC section (https://www.quickguide.org/post/eye-astigmatism-part-1) .To explain in a lucid way, we will talk in terms of corneal astigmatism or cylinder, and its correction with prescription glasses. Imagine you visit your doctor and he/she finds out that you have only astigmatism with no myopia or hypermetropia. In this case