Chapter : 5. Human Eye & Colourful World
Astigmation
4. Astigmation :
A person suffering from this defect cannot simultaneously focus on both horizontal and vertical lines of a wire gauze.
(Normal Wire Gauge)
(Wire gauge with distorted vertical lines)
(Wire gauge with distorted horizontal lines)
This defect arises due to the fact that the cornea is not perfectly spherical
This defect can be corrected by using cylindrical lens
(cylindrical lens)
A person suffering from this defect cannot simultaneously focus on both horizontal and vertical lines of a wire gauze.
(Normal Wire Gauge)
(Wire gauge with distorted vertical lines)
(Wire gauge with distorted horizontal lines)
This defect arises due to the fact that the cornea is not perfectly spherical
This defect can be corrected by using cylindrical lens
(cylindrical lens)
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