By A.K. Khurana
5th version has been completely revised and up to date with out altering the elemental texture and association of the ebook which contain:
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Extra resources for Comprehensive ophthalmology
Broadly, there are two types of astigmatism: regular and irregular. , there are two principal meridia). Etiology 1. Corneal astigmatism is the result of abnormalities of curvature of cornea. It constitutes the most common cause of astigmatism. 2. Lenticular astigmatism is rare. It may be: i. Curvatural due to abnormalities of curvature of lens as seen in lenticonus. ii. Positional due to tilting or oblique placement of lens as seen in subluxation. iii. Index astigmatism may occur rarely due to variable refractve index of lens in different meridia.
These include: tiredness of eyes, frontal or fronto-temporal headache, watering and mild photophobia. These asthenopic symptoms are especially associated with near work and increase towards evening. 3. Defective vision with asthenopic symptoms. When the amount of hypermetropia is such that it is not fully corrected by the voluntary accommodative efforts, then the patients complain of defective vision which is more for near than distance and is associated with asthenopic symptoms due to sustained accommodative efforts.
I) The convex lens is thick in the centre and thin at the periphery (ii) An object held close to the lens, appears magnified. (iii) When a convex lens is moved, the object seen through it moves in the opposite direction to the lens. Uses of convex lens. It is used (i) for correction of hypermetropia, aphakia and presbyopia; (ii) in oblique illumination (loupe and lens) examination, in indirect ophthalmoscopy, as a magnifying lens and in many other equipments. Image formation by a convex lens. 2 and Fig.
Comprehensive ophthalmology by A.K. Khurana