Biometric constancy of the anterior eye segment as demonstrated by slit image photography according to the Scheimpflug principle.

According to the accommodation changes in the lens described by Brown, the distance from the cornea vertex was determined in 192 Scheimpflug photos with the aid of a line drawn through the equator of the lens nucleus. The mean value for this section of the total distance was 5.75 mm, the variations being within the range of 5.38-5.9 mm. These results are of importance in the development of refraction and emmetropization of the eye as well as for the determination of the postoperative anterior chamber depth in cataract surgery and a criterion for the different types of glaucoma.