2006-08-02 20:21:16 · 4 answers · asked by Anonymous in Education & Reference ➔ Homework Help
Deafness.
Blindness.
Color blindness.
Macular degeneration.
2006-08-02 20:26:13 · answer #1 · answered by No Shortage 7 · 0⤊ 0⤋
Usher's syndrome:
Usher's Syndrome is a recessive disorder which causes both visual and hearing impairment. Usher's only occurs in individuals who received the recessive gene for it from both of their parents, and consequently its incidence is very low (3 per 1000,000 births). However, this syndrome is the cause of approximately 10% of all hereditary deafness. People with Usher's are born with a congenital profound sensorineural hearing loss. Generally a child with Usher's will develop visual difficulties in childhood which result in night-blindness, usually by the age of ten. Visual acuity and visual fields will continue to decrease as the child grows older. This progressive loss of vision is called Retinitus Pigmentosa (RP). Usually RP will result in complete blindness between the ages of 20 and 30. Currently there is nothing that can be done to cure Usher's Syndrome. However, if a family is aware that they carry the gene for Usher's, genetic counseling is recommended.
2006-08-02 20:26:35 · answer #2 · answered by ashlibby 2 · 0⤊ 0⤋
glaucoma--a disease of the eyes involving increased pressure inside the eyes, which causes damage to the optic nerve and can cause blindness
2006-08-02 21:30:17 · answer #3 · answered by parachute 3 · 0⤊ 0⤋
Two big, common one comes to mind:
deafness and blindness.
2006-08-02 20:26:11 · answer #4 · answered by quntmphys238 6 · 0⤊ 0⤋