Description
This article is from the Vision and Eye
Care FAQ, by grants@research.canon.com.au (Grant Sayer) with
numerous contributions by others.
1.4 What is Astigmatism ?
An astigmatic eye generally has two different meridians, at 90degrees to
each other, which cause images to focus in different planes for each meridian.
The meridians can each be either myopic, hyperopic or emmetropic.
The correction for astigmatism is a lens power at a particular direction
of orientation [ see section 4.1 ]
Astigmatism causes images to be out of focus no matter what the distance.
It is possible for an astigmatic eye to minimise the blur by accommodating,
or focusing to bring the "circle of least confusion" onto the retina.
URL: http://www.west.net/~eyecare/astigmatism.html
- details and pictures to explain the condition.
URL: http://www.web-xpress.com/vhsc/astigm.html
- diagrams and questions and answers about the causes, symptoms
of astigmatism.
URL: http://www.sna.com/etonline/vision
- still under construction but contains a large amount of eyecare
information
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health, vision, eye care, contact lenses, spectacles, eyecare, prescriptions, sunglasses, surgery
