Astigmatism is a condition which is caused by defects within the eye and that can be problematic to a patient’s vision as a result. Usually present from birth, astigmatism is common and can be corrected by a prescription given by the optometrist following a sight test examination.
Put simply, astigmatism can perhaps be best described as present in cases whereby the cornea of a patient is irregular in shape. Light that reaches the cornea that is not perfectly spherical in shape cannot then be focused correctly on the retina, and this is what causes blurred vision in astigmatic patients. This irregularity in shape of the cornea is more often described as being rugby-ball shaped rather than like a football.
Astigmatism can also be brought about as a result of a number of different occurrences, such as infection or injury to the cornea, changes to the cornea as a result of surgery, keratoconus, keratoglobus, and other infections and conditions that affect the eyelids, the cornea or the lens.
As mentioned, the cylinder portion of a sight test prescription is the area that the optometrist uses to correct the blurred vision that can occur as a consequence of astigmatism. To arrange your sight test at our practice, please do not hesitate to click here or book directly by telephone on 01268 752919.