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Chapter-08 Optics and Refraction

BOOK TITLE: Self Assessment and Review of Ophthalmology

Author
1. Seetharam Sudha
ISBN
9789386322425
DOI
10.5005/jp/books/14178_9
Edition
2/e
Publishing Year
2018
Pages
12
Author Affiliations
1. Laxmi Eye Institute, Panvel, Navi Mumbai, Maharashtra, India
Chapter keywords
Optics, refraction, refractive error, retinoscopy, total refractive power, cornea, myopia, hypermetropia, astigmatism

Abstract

The process of determining and correcting the refractive error of a patient is called refraction. At first an objective assessment of the refractive error is done by retinoscopy. This chapter covers the basics of refraction in the eye, errors of refraction, and errors of accommodation. The total refractive power of the eye is 58–60 dioptres. The refractive power of the cornea is 44–45 dioptres. The refractive power of the lens is 15-16 dioptres. Errors of refraction are myopia, hypermetropia, astigmatism, and anisometropia. In this chapter, 35 questions are provided along with their answers.

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