Last Updated on Aug 18, 2017

Glossary

Down Syndrome: A disorder caused by the presence of an extra chromosome 21 and characterized by mental retardation and distinguishing physical features.

Cerebral palsy: Defect of motor power and co-ordination caused by damage to the developing brain.

Optometrist: A professional trained to test, detect, and treat eye problems by prescribing and adapting corrective lenses and other optical aids.

Refractive error: A defect in the eye that prevents light from being brought to a single focus exact on the retina when the accommodation is at rest.

Duane’s syndrome: a disorder present at birth consisting of horizontal movement restriction due to fibrosis of one or more muscles that are responsible for moving the eyes.

Fibrosis: the presence of fibrous (scar like) tissue, that prevents normal functioning of a particular organ.

Myopia: Refractive error in which parallel rays of light from  infinity are focused in front of the retina when the accommodation is at rest.

Hypermetropia: Refractive error in which parallel rays of light from infinity are focused behind the retina when the accommodation is at rest.

Accommodation: Increase in the converging power of the lens for seeing clearly at near distances.

Astigmatism: Different degrees of refraction in different meridians.

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