Loss of vision in the center of the visual field (central scotoma).

As expected, visual field testing in cone dystrophy usually reveals a central scotoma.

Bitemporal hemianopia with or without central scotoma is present if the lesions have affected the body of the chiasm.

Defective vision with a central scotoma is accompanied by a weak intellect which is followed by spasticity and convulsions.

This will produce an ipsilateral optic neuropathy, often manifested as a central scotoma, and a defect involving the contralateral superotemporal field.

However, in high-degree myopia, it may extend to the upper and lower borders, or form a complete ring around the optic disc and form a central scotoma.

Formaldehyde and related compounds such as formic acid have a huge ocular toxicity, the vision becomes blurred, it happens a central scotoma (central vision is lost) and eventually blindness happens.

The loss of peripheral vision while retaining central vision is known as tunnel vision, and the loss of central vision while retaining peripheral vision is known as central scotoma.

Signs and symptoms of acute optic neuropathy include painless loss of vision which may affect either one or both eyes, reduced visual acuity, reduced color vision, relative afferent pupillary defect, central scotoma, swollen optic disc, macular edema, or retrobulbar pain.