INTERNATIONAL JOURNAL OF
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Corneal topography and astigmatism evaluation following small incision cataract surgery and phacoemulsification

Author: Bhojak Ashish1*, Tilak Prajapati2, Amitbhai Patel3

1M.S. Ophthalmology, Ahmedabad

2M.S. Ophthalmology, C. H. Nagri Eye Hospital, Ahmedabad

3Ex-Professor of ophthalmology, C. H. Nagri Eye Hospital, Ahmedabad

ABSTARCT

BACKGROUND: Cataract is the commonest cause of correctable dimness of vision among adults. Over two-third of the population over age 60 has a visual problem due to cataract; over a million people undergo a cataract removal surgery annually. Using modern methods, poor vision from cataracts can be improved 98% of the time. This study aims to evaluate corneal topographical changes in corneal curvature following phacoemulsification (PHACO) and following small incision cataract surgery (SICS), to compare mean corneal astigmatism following different site and size of incision, and to estimate induced astigmatism and its association with refraction. MATERIALS AND METHODS: This is prospective study of 100 patients underwent cataract extraction in 50 with PHACO and 50 with SICS with PC IOL implantation in our eye hospital during the period 2008 to 2011. The patients of cataract were randomly selected from OPD and operated by single consulting surgeon. Post-operative assessment was done at 1, 3, 6, 12, and 24weeks, at each visit patients were evaluated for corneal topography and induced astigmatism. RESULTS: In our study percentage of female patients (70%) was significantly higher in SICS compare to PHACO where male dominated (64%).  Overall study subjects had 53% females. The Keratometry (K) topography was inversely proportioned to AL whereas Intra ocular lens (IOL) power remained in the range of about 20.50 to 22.50 D in all cases due to neutralizing effect of K on AL. The post-operative study of mean astigmatism showed that, in both the groups there was a trend of decreasing astigmatism over a period of time but the decrease was more in PHACO as compare to SICS. CONCLUSION: From this study we concluded that the PHACO wound relatively stable right from beginning and initial induced astigmatism relatively low. Keratometry (K) topography was inversely proportioned to AL whereas Intra ocular lens (IOL) power remained in the range of about 20.50 to 22.50 D in all cases due to neutralizing effect of K on AL. The post-operative study of mean astigmatism showed that, in both the groups there was a trend of decreasing astigmatism over a period of time but the decrease is more in PHACO as compare to SICS.

Keywords: Corneal Topography, Astigmatism, Small Incision Cataract Surgery, Phacoemulsification
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