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Wavefront profile affected by tear film

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OSAKA, Japan — Wavefront aberrations should be measured carefully to avoid the effects of tear film breakup, a study here suggests. The status of the tear film could have an effect on wavefront measurements in refractive surgery, the study authors said.

Researchers with Osaka University Medical School examined higher-order aberrations in 20 eyes of 20 normal subjects with a Shack-Hartmann wavefront sensor before and after tear film breakup. Higher-order aberrations for photopic vision after tear film breakup increased 1.44-fold compared with higher-order aberrations before tear film breakup. Higher-order aberrations for scotopic vision after tear film breakup were also 1.23 times higher than those before breakup.

The study is published in American Journal of Ophthalmology.