The SLO allows for the evaluation of cataract and corneal changes. Keratometry can show a perfectly centered ablation, but the corresponding SLO can reveal a small optical zone, large transition zone and peripheral annular optical zone, which could trigger complaints of diplopia. It also can assess keratoconus. When combined with automated keratometry, a subtraction technique can be created to separate qualitatively the corneal and lens contributions to the wave front aberrations. This is an example of cataract, also causing an annular disturbance on the SLO image.
Photograph shows a complicated case of radial keratotomy, where epithelial ingrowth was present.
The SLO image is demonstrating the very small useful optical zone, large transition zone and even a peripheral annular optical zone, untreated, all of this explaining the patient's subjective complaints of diplopia. See full Disclaimer . All Rights Reserved.