Comparison of Hirschberg Test with Prsim and Alternate Cover Test in Measuring the Ocular Deviation

ABSTRACT

Measurements of ocular deviation were obtained from 45 exotropes and 31 esotropes, using Hirschberg corneal reflex test, and prism and alternate cover test respectively. The mean angle of devation in exotropes was 27.42 +/- 8.60 delta by Hirschberg test, 27.80 +/- 8.11 delta by prism and alternate cover test. There was no significant difference between these two groups (p>0.05). The mean angle of deviation in esotropes was 28.55 +/- 12.92 delta by Hirschberg test, 31.58 +/- 13.08 delta by prism and alternate cover test. The difference between these two groups was significant (p<0.05). In patients whose angle kappa was zero and exotropes whose angle kappa was positive, there was no significant diHerence between the two tests. In esotropes whose angle kappa was positive, the mean angle of deviation was 29.74 +/- 15.59 delta by Hirschberg test, and 33.47 +/- 15.91 delta by prism and alternate cover test. The difference between the two groups was significant (p