OPT 251 Midterm 2 #1: Low Vision Introduction: Definitions & Demographics

How is vision loss and blindness defined by the CDC?

Vision loss: BCVA 20/40 or worse.

Blindness: BCVA 20/200 or worse.

What is the leading cause of blindness in Americans over the age of 60?

AMD

What is the leading cause of blindness in working age American adults?

DR

Causes of blindness worldwide (in descending order)

Cataract, glaucoma, RE, AMD, DR

"Disorder" describes effect on what? Give an example

Anatomical tissue, organ. AMD.

"Disability" describes effect on what? Give an example

Ability to perform tasks. Reading.

"Dysfunction or impairment" describes effect on what? Give an example

Physiological function. Reduced visual acuity.

"Handicap" describes effect on what? Give an example

Activities of life. Personal mail.

Why determine legal blindness?

Social security disability insurance program, supplemental security income, higher deduction on tax return, transit discount, handicap parking placards, CA telephone access program, free sport fishing license, and eligibility for housing/vocational training.

Define legal blindness.

BCVA worse than 20/100. VF w/ widest diameter no greater than 20 degrees.