Irregular astigmatism is refractive error in which there is change of refractive power in indifferent way or in irregular way in different meridia.
Types-
1. Curvatural irregular astigmatism.
2. Index irregular astigmatism.
Symptoms-
1. Difficulty in viewing things.
2. Blurred images.
3. Polyopia.
Investigations-
1. Placido’s disc test.
2. Photokerotoscopy.
3. Computerized corneal topography.
Treatment-
1. Optical treatment.
2. Photo-therapeutic keratectomy.
3. Surgery.
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