Inability to see well at night or in poor light.

A cataract is an opacity or clouding that develops in the crystalline lens of the eye or in its capsule.

Well-demarcated area(s) of partial or complete depigmentation in the macula, reflecting atrophy of the retinal pigment epithelium with associated retinal photoreceptor loss.

Pigment migration into the retina in a bone-spicule configuration (resembling the nucleated cells within the lacuna of bone).

A macular coloboma is an area of 2-6 disk diameters in which there is total or considerable chorioretinal maldevelopment, often with extasia of the underlying sclera which produces the white appearance visible ophthalmoscopically (summary by Phillips, 1970).

An inherited retinal disease subtype in which the rod photoreceptors appear to be more severely affected than the cone photoreceptors. Typical presentation is with nyctalopia (due to rod dysfunction) followed by loss of mid-peripheral field of vision, which gradually extends and leaves many patients with a small central island of vision due to the preservation of macular cones.