Spontaneous alterations of the corneal topographic pattern

Immediately after blinking, the ocular surface regularity improves, possibly due to the building up of the tear film. This is followed later by the distortion of the ocular surface, which is the precursor of the tear-film break up phenomenon. Because of these changes, even in healthy eyes, the optimization and standardization of the postblink time of topographic image capture are very important, especially for planning refractive surgery.