keratoscopy

noun Ophthalmology.

1. an instrument, as Placido’s disk, for determining the symmetry of the curvature of the cornea.

n.

1. Examination of the anterior surface of the cornea to determine the character and amount of corneal astigmatism.

n.

1. An instrument marked with lines or circles for use in examining the curvature of the cornea.Placido’s disk