The incidence and degree of scleral show in the normal population.

The degree and incidence of scleral show in a normal population was studied in 100 Caucasian patients. Subjects were fitted with a headband goniometer. The goniometer was related to a standard anatomic landmark (the Frankfort plane), and the subject's head was inclined through angles of 0 to -35 degrees. With the subject fixing on a constant point, the degree of white showing between the lower eyelid and the limbus was measured. The results demonstrated that scleral show was a normal finding, the degree of which increases with increasing inclination of the head from the Frankfort plane. No sex variation or increase with age was noted.