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Measuring posterior astigmatism in patients after cataract surgery

Poster Details

First Author: H.Hsu TAIWAN

Co Author(s):    W. Lai              

Abstract Details


To evaluate the posterior astigmatism in pseudophakic patients with monofocal and multifocal intraocular lenses (IOLs).


Case series in Min-Sheng Hospital, Taoyuan, Taiwan


96 eyes of 48 consecutive patients all received the cataract surgery from January to December in 2012. Refractive and corneal astigmatism was measured using auto kerato-refractometer before and 2 months after cataract surgery. Posterior astigmatism was calculated by comparing the refractive outcome and corneal power measurements using vector analysis.


The mean posterior corneal astigmatism was -0.64 diopter (D). The steep posterior corneal meridian was aligned vertically (60 to 120 degrees) in 81.3% of eyes, horizontally (0 to 30 and 150 to 180 degrees) in 13.6% of eyes and obliquely (30 to 60 and 120 to 150 degrees) in 5.1% of eyes. The vector difference between both eyes of posterior astigmatism was 0.48 D. The vector difference less than 0.25 D between both eyes was 52.1% of patients, and that more than 0.75 D was 22.9% of patients.


Posterior astigmatism can be measured after cataract surgery even without rotating Scheimpflug analyzer (Pentacam). Almost half patients have the same correlation of posterior astigmatism between both eyes. Total corneal astigmatism should be detected by Pentacam when using toric IOL. FINANCIAL INTEREST: NONE

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