VISUAL IMPAIRMENTS INCLUDING BLINDNESS
IDEA DEFINITION OF VISUAL IMPAIRMENT INCLUDING BLINDNESS:
An impairment in vision that, even with correction, adversely affects a child's educational performance. The term includes both partial sight and
blindness.

LEGAL BLINDNESS is defined as visual acuity of 20/200 or worse in the best eye with correction, as measured on the Snellen Test, or a visual field
of 20% or less.

VISUAL ACUITY -- sharpness or clearness of vision.

LOW VISION -- visual acuity of between 20/200 and 20/70 in the best eye with correction.

PREVALENCE VISUAL IMPAIRMENTS and BLINDNESS

Approximately 1 in 3,000 American children is considered legally blind, and 3% of the
total population (9 million people) have a significant vision loss that will require some
type of specialized support or services. About 5% of American children (~ 1.2 million)
have a serious eye disorder. In 2002, the Department of Education reported that
25,975 school children with vision loss between ages 6 and 21 received specialized
services.

POSSIBLE CAUSES OF VISION PROBLEMS (A to Z or something...):

Abinism
Abnormalities of the iris
Amblyopia
Anophthalmia
Aphakia
Asphyxia
Benign Essential Blapharospasm (BEB)
Bilateral Optic Nerve Hypoplasia
Cataracts
Cortical visual impairment
Dacryocystitis
Diabetes
Diabetic Retinopathy
Diplopia (Double Vision)
Drugs and medications
Glaucoma or buphthalmos
Hydrocephalus
Infections
Inflammations
Iritis
Juvenile Retinoschisis
Leprosy
Lesions of the cornea
Macular degeneration
Macular Pucker
Microphthalmia
Onchocerciasus
Optic atrophy
Optic Neuritis
Poisons
Prenatal radiation
Retinal Detachment
Retinitis pigmentosa
Retinoblastoma
Retinopathy of prematurity
Seizures
Severe myopia with retinal detachment
Strabismus
Stroke
Teratogens
Trachoma
Trauma
Tumors
Vitreous Disorder (floaters)
Xerophthalmia (vitamin A deficiency)
GO TO:
AUTISM
INTELLECTUAL DISABILITY
SPECIFIC LEARNING DISABILITY
TRAUMATIC BRAIN INJURY
OTHER HEALTH IMPAIRMENT
MULTIPLE IMPAIRMENTS
ORTHOPEDIC IMPAIRMENT
EMOTIONAL IMPAIRMENT
DEAF/BLIND
DEAF
HEARING IMPAIRMENT
SPEECH AND LANGUAGE IMPAIRMENT