Psychology 2043A/B Lecture Notes - Lecture 10: Cortical Visual Impairment, Cuisenaire Rods, Visual Acuity

• School: Western University
• Department: Psychology
• Course: Psychology 2043A/B
• Professor: Esther Goldberg

Document Summary

Tremendous importance of vision in obtaining information about our world. Students with visual impairments may learn to make good use of their other senses. Never totally compensate for loss of vision. Under idea, visual impairment has both legal and educational definitions. Visual acuity = ability to clearly distinguish forms or discriminate among details: most often measured by reading letters, numbers, or other symbols from the snellen. 20/20 vision does not mean perfect vision indicates that at a distance of 20 feet, the eye can see what a normally seeing eye sees from 20 feet. Someone whose visual acuity is 20/200 or less in the better eye with use of corrective lens is considered legally blind. Any individual with visual acuity no better than 20/70 after correction is considered partially sighted. One may also be considered legally blind if field of vision is extremely restricted. Normal eye can see objects within a range of 160-170 degrees.