Non-24 is rare among visually impaired patients who retain at least some light perception.

Vision in these patients can be normal to hand movements or light perception only.

She now has light perception in her left eye, but nothing more.

Vision loss is usually severe, ranging from counting fingers to no light perception.

Nowadays some cases do occur, almost always associated with prematurity, and the result can vary from light perception only to relatively good vision.

As bad as it is, I'm surprised you still have any light perception at all.

Except for light perception, the child was blind.

By this point, the vision is light perception impaired or non-existent.

The rest have some vision, from light perception alone to relatively good acuity.

Visual acuity can range from no light perception to near-normal vision.