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1 in 4,000 people [ 1 ] Retinitis pigmentosa (RP) is a member of a group of genetic disorders called Inherited Retinal Dystrophy (IRD) that cause loss of vision. [ 1 ] Symptoms include trouble seeing at night and decreasing peripheral vision (side and upper or lower visual field). [ 1 ] As peripheral vision worsens, people may experience ...
Pigment dispersion syndrome (PDS) is an eye disorder that can lead to a form of glaucoma known as pigmentary glaucoma. It takes place when pigment cells slough off from the back of the iris and float around in the aqueous humor. Over time, these pigment cells can accumulate in the anterior chamber in such a way that they begin to clog the ...
Ophthalmology. Central serous chorioretinopathy (CSC or CSCR), also known as central serous retinopathy (CSR), is an eye disease that causes visual impairment, often temporary, usually in one eye. [1][2] When the disorder is active it is characterized by leakage of fluid under the retina that has a propensity to accumulate under the central ...
1 in 100,000. Blue cone monochromacy (BCM) is an inherited eye disease that causes severe color blindness, poor visual acuity, nystagmus, hemeralopia, and photophobia due to the absence of functional red (L) and green (M) cone photoreceptor cells in the retina. BCM is a recessive X-linked disease and almost exclusively affects XY karyotypes.
8.7% global prevalence in 2020 [ 2 ] Macular degeneration, also known as age-related macular degeneration (AMD or ARMD), is a medical condition which may result in blurred or no vision in the center of the visual field. [ 1 ] Early on there are often no symptoms. [ 1 ] Over time, however, some people experience a gradual worsening of vision ...
Lipofuscin. Lipofuscin is the name given to fine yellow-brown pigment granules composed of lipid -containing residues of lysosomal digestion. [1][2] It is considered to be one of the aging or "wear-and-tear" pigments, found in the liver, kidney, heart muscle, retina, adrenals, nerve cells, and ganglion cells. [3]
FMA. 58627. Anatomical terminology. [edit on Wikidata] The pigmented layer of retina or retinal pigment epithelium (RPE) is the pigmented cell layer just outside the neurosensory retina that nourishes retinal visual cells, and is firmly attached to the underlying choroid and overlying retinal visual cells. [1][2]
General. [edit] Rhodopsin is a protein found in the outer segment discs of rod cells. It mediates scotopic vision, which is monochromaticvision in dim light. [7][19]Rhodopsin most strongly absorbs green-blue light (~500 nm)[20][21]and appears therefore reddish-purple, hence the archaic term "visual purple".