Copenhagen 2016 Registration Programme Exhibitor Information Virtual Exhibition Satellite Meetings Glaucoma Day 2016 Hotel Star Alliance

10 - 14 Sept. 2016, Bella Center, Copenhagen, Denmark

This Meeting has been awarded 27 CME credits


escrs app advert yo advert

Vectorial difference between subjective astigmatism and keratometric astigmatism to improve toric IOL outcomes

Search Title by author or title

Session Details

Session Title: Presented Poster Session: Toric IOLs II

Session Date/Time: Monday 12/09/2016 | 15:00-16:30

Paper Time: 15:50

Venue: Poster Village: Pod 1

First Author: : J.Varas ECUADOR

Co Author(s): :                  

Abstract Details


In order to maximize toric IOL outcomes it is important to know the difference between subjective astigmatism and anterior keratometric astigmatism. If this resultant vector is used at the moment of the toric IOL calculation it is possible improve the predictability of our calculations.


Private practice at the Centro Oftálmico Varas Samaniego. Guayaquil, Ecuador.


This is a retrospective analysis of more than 6000 eyes of patients who underwent laser refractive surgery from 2002 to 2014. A vectorial difference was conducted using subjective refraction and anterior keratometry (using an autorrecfractor); this differences were classified in a 3 by 3 matrix (With the Rule [WTR], Against the Rule [ATR] and oblique astigmatism [OA] vs low, medium and high astigmatism)


As we increase the anterior WTR keratometric astigmatism the amount of ATR posterior astigmatism decreases, whereas if we increase the anterior ATR astigmatism the posterior component of ATR increases.


It is possible to use a variable vector depending of the keratometric astigmatism to estimate the posterior astigmatism magnitude and direction to include in an IOL toric calculation and improve toric IOL calculations.

Financial Disclosure:


Back to previous