To the Editor.
—One major advantage of silicone oil over short- and long-acting intraocular gases is the ability of the patient to see through this vitreous substitute postoperatively. It is recognized that eyes with intraocular gas do not have useful vision. Consequently, there is a delay in assessing the postoperative visual recovery in eyes with intraocular gas bubbles.We measured reading visual acuities in 11 aphakic eyes, with gas bubbles occupying more than two thirds of the volume of the ocular cavity. Initially, subjective refraction of three patients at 33-cm reading distance necessitated a correction varying between +28 diopters (D) and +38 D. Thereafter, we found that holding an aspheric biconvex lens (+28 D or +30 D, used for indirect ophthalmoscopy) in front of the eye and varying the vertex distance yielded the same final reading visual acuities. Reading visual acuities in 11 patients varied from hand motions to 20/20.
Mansour AM, Holladay JT. Visual Acuity and Intraocular Gas. Arch Ophthalmol. 1988;106(10):1345-1346. doi:10.1001/archopht.1988.01060140509005