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Chapter-15 Some Useful Terms

BOOK TITLE: Optician’s Guide (A Mannual for Opticians)

Author
1. Bhootra Ajay Kumar
ISBN
9789351528241
DOI
10.5005/jp/books/14237_16
Edition
3/e
Publishing Year
2018
Pages
5
Author Affiliations
1. Diploma in Sportvision (UK), Krishnalaya School of Optometry, Kolkata, West Bengal, India, ICLEP FIACLE (Australia); (UK)
Chapter keywords
Amblyopia, adaptation, anisometropia, dry eye, dispersion, UV ray, night blindness, scotoma, visual acuity, color blindness, binocular single vision

Abstract

Some useful terms of optometry are defined in this chapter. Amblyopia is a condition of diminished visual acuity which is not a result of any clinically identifiable organic lesion of the visual pathway and is not relieved by any optical device. Adaption is the ability of our body or any organ of our body to adjust to its environment either externally or internally. Aphakia means the absence of lens from the eye. In most cases it is due to removal of the lens by surgery. A dry eye is a condition in which the precorneal tear film is deficient and cannot fulfil its normal function of lubricating the anterior surface of the cornea. Visual acuity is defined as the power to distinguish an object from the other and to appreciate the details of the visible object.

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