Insight Into Eyesight: Astigmatism

One of the eye problems that causes blurred vision is astigmatism. This happens when the cornea, or “window of the eye”, is out of shape. A normal cornea has a perfect curve, with the same degree of slope on all sides. Light rays that pass through the cornea come together at a single point on their way to the retina.

This simply isn’t possible in the astigmatic eye. The rays of light don’t come together at the same point. There are two separate images. This doesn’t mean that people with astigmatism see double, but it does blur their vision.There are three kinds of astigmatism, depending on eye’s point of focus. It’s “nearsighted” if the focus takes place before the image gets to the retina; “farsighted” if the image reaches the retina, or it can be a combination of the two. In all cases, fortunately, vision can be corrected with properly prescribed eyeglasses.


(Hons. BSc, MSc, O.D., F.I.O.S)

6633 Hwy 7 at 9th Line

Markham, Ontario

905-471-EYES (3937)

Insight into Eyesight is a series of short informative articles on eye care that have been published in the Markham Economist and Sun for over a decade. To read more of these articles, please click on the Insight to Eye Sight link in the Categories section on the right of the page.

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