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Hypnosis and keratometry

A Humphrey Auto Keratometer was used to evaluate the changes in corneal astigmatism that occurred under hypnosis. The measurements were made at the visual axis and the corneal apex in eight subjects. These measurements were taken before, during and after hypnosis. The mean of the changes occurring at the visual axis was 0.40 diopters with some corneas changing as much as 0.62 diopters. The mean change at the corneal apex was 0.23 diopters with some corneas changing as much as 0.37 diopters. These corneal changes are attributed to the relaxation of lid tension after hypnosis.