Comparison of Manual Keratometer with Autokeratometer

Reshma Ramakrishnan and Abhijit Naik

B-604, Neelsiddhi Splendour, Sector 15, Plot Number 58 and 65, CBD Belapur, Navi Mumbai - 400614, India.

ABSTRACT: The study was done to compare the corneal curvature readings obtained by Baush and Lomb manual keratometer with that of Nidek autokeratometer ARK-30 to find if either was superior to the other. Curvature of central 3mm corneal zone was measured in horizontal and vertical meridian with Bausch and Lomb manual keratometer and Nidek autokeratometer ARK-30 in 67 eyes of 52 patients between the age group 53 and 75. The readings were correlated and intraclass correlation (ICC) was calculated with 95% confidence limit. Mean +/- one Standard Deviation of differences between two readings (manual versus auto) was calculated. The autokeratometric values were predicted from manual readings using linear regression model. Vertical and horizontal readings obtained by two methods were comparable. Differences in values obtained by two methods were statistically insignificant. The corneal curvature readings obtained by Bausch and Lomb manual keratometer were comparable with that obtained by Nidek autokeratometer ARK-30.

KEYWORDS: Manual Keratometer; Autokeratometer

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