Review evaluates corneal apex measurement techniques, finding no significant corneal toricity reduction.
Methods to measure the position of the corneal apex are reviewed and evaluated. The recommended method is with a small‐mire keratometer that has a target mounted independently of the drum. The corneal apexes for eight subjects were found to be decentered from their linea of sight but a directional trend was not apparent. We did not find a significant reduction in corneal toricity at the apex as compared to the line of sight, as was reported by Ludlam.
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Mandell et al. (1969) studied this question.
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