I have included in this report all cases of refraction examined under a cycloplegic that came under my care from December, 1901, to December, 1903. The errors of refraction were estimated in the usual manner with trial lenses. The instrument used in making the corneal measurements was the ophthalmometer of Chambers, Inskeep & Co. On the side of one of the recording wheels the curvature of the corneal meridians can be read off in millimeters. This instrument, so far as I know, is accurate. It does not measure corneal meridians whose radii of curvature are shorter than 6.85 mm., nor of those longer than 9.00 mm.
Reference to Table 1 shows that out of 2,092 corneal meridians examined, 1,273 were hypermetropic in refraction, 507 myopic and 312 emmetropic. It was found that the instrument measured all corne that came under my observation, except one case of conical
BLACK M. THE RELATION OF CORNEAL CURVATURES TO THE REFRACTION OF THE EYE.. JAMA. 1905;XLIV(5):378–379. doi:10.1001/jama.1905.92500320042001g
Customize your JAMA Network experience by selecting one or more topics from the list below.