Retinitis
pigmentosa (RP) refers to a group of inherited diseases causing retinal
degeneration. The cell-rich retina lines the back inside wall of the eye. It is
responsible for capturing images from the visual field. People with RP
experience a gradual decline in their vision because photoreceptor cells (rods
and cones) die. Forms of RP and related diseases include Usher syndrome,
Leber’s congenital amaurosis, rod-cone disease, Bardet-Biedl syndrome, and
Refsum disease, among others.
Symptoms depend on whether rods or
cones are initially involved. In most forms of RP, rods are affected first.
Because rods are concentrated in the outer portions of the retina and are
triggered by dim light, their degeneration affects peripheral and night vision.
When the more centrally located cones – responsible for color and sharp central
vision – become involved, the loss is in color perception and central vision.
Night blindness is one of the earliest
and most frequent symptoms of RP. People with mainly cone degeneration,
however, first experience decreased central vision and ability to discriminate
color.
http://communityhyperbaric.com/wp-content/uploads/2013/10/Slowing-the-degenerative-process-long-lasting-effect-of-hyperbaric-oxygen-therapy-in-retinitis-pigmentosa.pdf
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