What is astigmatism?
Astigmatism is an eyesight problem mainly caused by “incorrect curvature of the cornea”, i.e. the cornea is slightly oval in shape instead of being spherical.
Astigmatism is described in terms of :
- module (difference in curvatures)
- axis (orientation of curvatures)
Astigmatics have imprecise near and far vision their peripheral vision is unclear and they cannot clearly distinguish certain shapes and details or see contrasts clearly between horizontal, vertical or oblique lines.
Astigmatism may be combined with other eyesight problems such as myopia, hypermetropia or presbyopia.
Astigmatism is very common among young children and can have a negative impact on academic success since it causes confusion between letters and numbers.