The OPD helps me achieve the desired outcomes for both cataract and laser refractive surgeries.Before I choose an IOL or decide on limbal relaxing incisions, I need answers. Does the patient have astigmatism? Is it corneal or lenticular? Is it symmetrical or asymmetrical? What size is the pupil? Are there corneal aberrations? The system also lets me show patients a map of the aberrations in their visual system. They see how much spherical aberration they have, and I explain what that means in terms of halos and glare, which helps us agree on an appropriate treatment.