Question

Fitting a unilaterla aphakic eye causes diplopia that persists in the presence of prisms that superimpose the 2 images. The refractive error of the fellow eye is -5 D, and the image of the aphakic eye is described as larger that that of the fellow myopic eye. How can the diplopia be resolved.

Answer 1

To resolve diplopia caused by unilateral aphakia, a matching contact lens should be used in the aphakic eye with appropriate refractive power and cylindrical correction if astigmatism is present.

Step-by-step explanation:

The condition described involves an aphakic eye, which is an eye without a lens, often resulting in diplopia (double vision) when the size of the image differs from that in the fellow eye. The fellow myopic eye, with a refractive error of -5 D, forms a smaller image compared to the aphakic eye, due to the lack of the lens's refractive power in the aphakic eye. To resolve the diplopia, one can use a contact lens in the aphakic eye to match the refractive power of the fellow myopic eye. This contact lens needs to have the appropriate power to reduce the size of the image formed by the aphakic eye, making it comparable to the image of the myopic eye. Additionally, a cylindrical correction might be needed to correct any astigmatism that could contribute to the diplopia. In cases where diplopia persists despite these measures, other methods such as vision therapy or surgical intervention might be considered.