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

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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


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


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


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.


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.


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:


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