What does this research mean for the field?

Predicted residual astigmatism in corneal contact lens wearers is not reliably identified by the prediction method used in this study. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

The research aims to compare predicted residual astigmatism with measured values in contact lens wearers.

February 20, 2026

A Comparison of Predicted and Measured Residual Astigmatism in Corneal Contact Lens Wearers∗

Key Points

The research aims to compare predicted residual astigmatism with measured values in contact lens wearers.
Study involved 100 eyes adapted to contact lenses.
Predictions were made for against-the-rule residual astigmatism in 83 eyes.
Correlation between predicted and measured astigmatic error was assessed.
33 eyes had an error of -0.75 D or more predicted, but only 7 measured that much.
33 eyes showed an average of 0.47 D less astigmatism than predicted.
For 44 unadapted eyes, mean predicted and measured errors were nearly identical (0.479 D and 0.478 D).

Abstract

ABSTRACT In a study of 100 eyes adapted to contact lenses, a prediction of against‐the‐rule residual astigmatism was made for 83 eyes. The error was −0.75 D or more for 33 eyes, but after adaptation only 7 eyes measured that much astigmatism over contact lenses. An average of 0.47 D less against‐the‐rule astigmatism than predicted was measured for these 33 eyes. The correlation coefficient between predicted and measured astigmatic error was significant. r = 0.512, p<0.01. For 44 unadapted eyes, the mean predicted error was 0.479 D while the mean measured error over diagnostic lenses was 0.478 D. The study suggests that eyes requiring cylindrical corrections cannot be identified reliably by the prediction method outlined.

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