Ocular Biometric Values and Prevalence of Corneal Astigmatism in Patients Candidate for Cataract Surgery

Seyed Javad Hashemian; Seyed Mahyar Hashemian; Farid Karimian; Ali Hadavandkhani; Mohammad Ebrahim Jafari; Mahsa Sadat Hashemian; Yasaman Hadi; Fatemeh Nadjafi Semnani

doi:10.4103/joco.joco_33_21

Ocular Biometric Values and Prevalence of Corneal Astigmatism in Patients Candidate for Cataract Surgery

J Curr Ophthalmol. 2022 Apr 16;34(1):56-59. doi: 10.4103/joco.joco_33_21. eCollection 2022 Jan-Mar.

Authors

Seyed Javad Hashemian¹, Seyed Mahyar Hashemian², Farid Karimian³, Ali Hadavandkhani¹, Mohammad Ebrahim Jafari⁴, Mahsa Sadat Hashemian¹, Yasaman Hadi¹, Fatemeh Nadjafi Semnani¹

Affiliations

¹ Eye Research Center, Five Senses Institute, Rassoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran.
² School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
³ Labbafinejad Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
⁴ Iranian Eye Clinic, Tehran, Iran.

Abstract

Purpose: To analyze the biometric values and the prevalence of corneal astigmatism in cataract surgery candidates.

Methods: This is a prospective study. Ocular biometric values and corneal keratometric astigmatism were measured by optical low-coherence reflectometry (Lenstar LS 900) before surgery in patients who were candidates for cataract extraction surgery. Descriptive measurements of biometric dimensions and keratometric cylinder data and their correlations with sex and age were evaluated.

Results: Ocular biometric and keratometric values from 2084 eyes of 2084 patients (mean age 66.43, range 19-95 years) were analyzed. The mean values were as follows: corneal astigmatism 0.89 diopter (D), mean corneal keratometry 44.29 D, central corneal thickness 534 μ, internal anterior chamber depth (ACD) 3.11 mm, lens thickness 4.50 mm, and axial length 23.35 mm. Corneal astigmatism was <1.25 D in 1660 (79.5%) of eyes. Astigmatism was with-the-rule in 976 (46.8%) of eyes, against-the-rule (ATR) in 702 (33.7%), and oblique in 406 (19.5%). Analysis of corneal astigmatism revealed a change toward "ATR" with age which was not statistically significant. The ACD was correlated with age. The amount of corneal astigmatism had no correlation with age and sex.

Conclusion: Corneal astigmatism was higher than 1.25 D in about 21% of cataract surgery candidates with slight differences between the various age ranges and had no correlation with age and sex.

Keywords: Astigmatism; Cataract; Lenstar; Ocular biometry.