[Skip to Content]
[Skip to Content Landing]
March 1944


Arch Ophthalmol. 1944;31(3):268-269. doi:10.1001/archopht.1944.00890030097021

This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables.


To the Editor:  —In the article "Binocular Refraction with Cross Cylinder Technic," in the January issue (Arch. Ophth.31:34, 1944), Major H. Saul Sugar champions the concept of "spherical equivalents" in dealing with anisometropia requiring a refraction in cases of high cylinder correction.Ordinarily, in the effort to secure minimal blur, the eye with a high cylinder error tends to utilize this device by focusing for the interfocal circle. If the static error is + 2.00 D. cyl., axis 90, the active eye accommodates 1 D. and thus converts its correction to − 1.00 D. sph. XXX + 2.00 D. cyl., axis 90. Even with cycloplegia some refractionists not infrequently correct for a confusion disk rather than for a point of focus if their routine is first to determine the sphere that gives the best vision and then to add the weakest acceptable cylinder. On the other hand, refractionists who consider

First Page Preview View Large
First page PDF preview
First page PDF preview