The distribution of keratometry and corneal astigmatism in a population based study

Session Details

Session Title: Imaging Anterior Segment

Session Date/Time: Sunday 08/10/2017 | 16:00-18:00

Paper Time: 16:12

Venue: Meeting Center Room I

First Author: : A. Izadi IRAN

Co Author(s): :    F. Rezvan   H. Hashemi   M. Khabazkhoob              

Abstract Details

Purpose:

To determine the distribution of keratometry values in a wide age range of 6 to 90 years.

Setting:

Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran

Methods:

In this study, samples were selected from two villages in Iran using multi-stage random cluster sampling. After completing optometry and ophthalmic examinations for all cases, corneal imaging was done using Pentacam, and keratometry values were determined.

Results:

3314 people participated in the study, and analyses were done on data from 2672. Mean age was 36.30 ± 18.51 years. Mean keratometry in flat and steep meridians was 42.98 (42.9-43.06) diopters and 43.98 (43.91-44.07), respectively. Mean Mean-K was 43.48D (43.41-43.56). Mean keratometry increased linearly up to the age of 70 years, and the cornea became slightly flat afterwards. Mean keratometry was significantly higher in females (P<0.001). Myopic cases had the highest Mean-K (P<0.001). Only older age and female gender showed a statistically significant association with mean keratometry. 31.62% (29.14-34.09) of the sample had at least 1.0D of corneal astigmatism.

Conclusions:

This is one of the few studies worldwide that demonstrates changes in keratometry in a wide age range from childhood to old age. Results indicated that age and gender are variables associated with keratometry.

Financial Disclosure:

NONE