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CBSE Class 10 Answered

Defects of vision
Asked by Jaziya | 15 Jun, 2009, 09:21: PM
Expert Answer

The personis our case is suffering from astagmatism. The refractive error of the astigmatic eye stems from a difference in degree of curvature refraction of the two different meridians (i.e., the eye has different focal points in different planes.) For example, the image may be clearly focused on the retina in the horizontal (sagittal) plane, but not in front of the retina in the vertical (tangential) plane. Astigmatism causes difficulties in seeing fine detail, and in some cases vertical lines (e.g., walls) may appear to the patient to be tilted.

Answered by | 16 Jun, 2009, 03:34: AM
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