Q: I am a healthy 57-year-old female who frequently experiences double, blurred vision — even with glasses. This usually occurs after I’ve been reading, using the computer, or doing close work. My ophthalmologist has recently identified that it is only in my left eye.

A diagnostic test showed that the cornea surface is irregular, rather than even and concentric. He called it irregular astigmatism and said it can be corrected with specially- fit contact lenses. Can you please tell me more about it? Is it experienced by others?

A: A bit of brief blurred vision may be common, but not to the extent where a correctable disease is found. Unfortunately, you have an uncommon problem. It is typical for many individuals who sit at a computer all day, read for extended periods of time, do such things as intricate close-up work, and more to experience eye issues. This is not your case.

Regular astigmatism is a common visual problem experienced by many that, in most instances, can be corrected either with glasses or contact lenses. An irregular astigmatism, however, is not common and may not be corrected by glasses or regular contacts according to my sources. This disorder is identified when the cornea is marred by abnormal shapes, peaks, ridges and valleys that prohibits light from being focused properly on the lens. Depending on the severity of the case, mild irregular astigmatism may result in some blurring and distorted vision, whereas more severe cases can cause the appearance of multiple images that can be more difficult to treat and may be quite debilitating. While more difficult to treat than other forms of astigmatism, specialized contact lenses, followed only when necessary by a surgical procedure, is appropriate.

The condition may also result from keratoconus or from such things as having refractive surgery. If the treatment zone is not precisely centered, irregular astigmatism may occur. Custom RGP lenses have been found to be the best corrective option for patients with any type of irregular astigmatism. RGP lenses are rigid gas permeable lenses that is uniformly curved, rest on top of the cornea, and reduce how the imperfections in the corned affect incoming light. There are also laser surgeries performed that are not always completely perfect but do help most individuals see better than before. Keratoconus is a degenerative disorder of the eye caused by both thinning and a change in shape from the more normal curve to a more conical shape. It can cause major visual distortion that result in a sensitivity to light. This condition most commonly affects adolescents and can be managed by corrective lenses. It should be noted that some individuals have an irregular astigmatism from birth because of genetic factors.

You likely have problems focusing on close and far-range objects and have indicated your left eye is the only one affected. This situation has been observed in the past. Holding one eye closed may help, but it is not the answer. Visual issues such as this can result in headaches, nausea, and a gait abnormality and should be addressed.

It appears to me that your ophthalmologist is well-informed and while perhaps not answering your questions to the degree you would like, is managing your case well. Therefore, and providing you have the confidence in him or her, you might choose to follow the recommendations provided. Good luck.