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A pale disc is characteristic of long-standing optic neuropathy. In many cases, only one eye is affected and a person may not be aware of the loss of color vision until the examiner asks them to cover the healthy eye. Optic neuropathy is often called optic atrophy, to describe the loss of some or most of the fibers of the optic nerve.
This typically evolves to very severe optic atrophy and a permanent decrease of visual acuity. Both eyes become affected either simultaneously (25% of cases) or sequentially (75% of cases) with a median inter-eye delay of 8 weeks. Rarely, only one eye is affected.
Dominant optic atrophy was first described clinically by Batten in 1896 and named Kjer’s optic neuropathy in 1959 after Danish ophthalmologist Poul Kjer, who studied 19 families with the disease. [3] Although dominant optic atrophy is the most common autosomally inherited optic neuropathy (i.e., disease of the optic nerves), it is often ...
As the initial swelling of the optic disc subsides, optic atrophy generally develops within one to two months after onset. A retrospective diagnosis of optic atrophy due to previous ischemic optic neuropathy is often possible when a small optic disc is detected in both the affected and the opposite eye, and when other tests for potential causes ...
“This stroke also causes irreversible loss of vision in one eye.” “The ninth patient developed swelling in both optic nerves but did not lose vision,” Katz added. Rapid blood sugar changes ...
One would not expect to find an afferent pupillary defect because optic neuropathies are often bilateral and symmetric. [2] The optic disc may appear mildly hyperemic with small splinter hemorrhages on or around the disc, or may appear nearly normal. Optic atrophy typically develops later and may appear mild.
However, optic atrophy leads to permanent loss of vision. Irreversible damage to neural tissue can occur after approximately 15 minutes of complete blockage to the central retinal artery, but this time may vary between people. [12] Two thirds of people experience 20/400 vision while only one in six will experience 20/40 vision or better. [13]
The optic disc is where the axons from the retinal ganglion cells collect into the optic nerve. The optic nerve is the bundle of axons that carry the visual signals from the eye to the brain. This optic nerve must penetrate through the wall of the eye, and the hole to accommodate this is usually 20-30% larger than the nerve diameter.
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