Gokila M. S, Latha K. S. T
BACKGROUND Keratoconus is commonly associated with irregular myopic astigmatism. This astigmatic change is compared and analysed with the corneal topography and automated refractometry. MATERIALS AND METHODS 35 eyes of 20 patients of keratoconus were included in the study during the period July 2017 to July 2018 at a tertiary care hospital. All were subjected to detailed anterior segment, visual acuity, keratometry, automated refractometry and corneal topography examination. The range and severity of astigmatism obtained with corneal topography and automated refractometry were compared and analysed. RESULTS 75% of patients had bilateral and 25% had unilateral keratoconus. 50% of patients were in the age group of 10-20 years. 45% of patients were females and 55% were males. 51% of eyes had moderate K value (48-54 D). 43% of eyes had <6/60 of uncorrected visual acuity (UCVA). 74% of eyes showed higher cylindrical values in topography. 5% eyes showed some astigmatism value in both topography and automated refractometry (where the cone is present in visual axis). 85% of eyes improved after correction with spectacles. 15% did not improve with spectacles (because of high myopic astigmatism). 74% of eyes accepted lower cylinder values than revealed by corneal topography. CONCLUSION The assessment of astigmatism with the corneal topography shows higher values than the automated refractometry, but the acceptance of the cylinder values by the patient is good within AR values.
