Because the cones are predominantly concerned with daytime and vision in lighted situations, patients who have cone dystrophy often see better in dim illumination. Mucous membrane which lines the eyelids and covers the front part of the eyeball. The eye turn in towards the nasal side. In general the amount of the retinopathy is related to the duration of the disease rather than the severity of the disease. Both eyes are involved but usually to differing degrees.
Visual acuity is unaffected unless the central macular area is involved.
The seeing of one object as two. The eye turns outward to the temporal side. In this condition the patient feels they are looking straight ahead at the object, but in fact the image is stimulating an area just outside the fovea. An obvious or manifest deviation of the visual axis of an eye out of alignment with the other eye. A tendency of one eye to deviate upward.