Astigmatism is a condition where the cornea is shaped like a rugby ball (oval) rather than a soccer ball (round). This causes light rays to focus at different points in the eye causing difficulty with near and distance vision.
Symptoms
Blurry vision at all distances is a classic symptom. Headaches and eye fatigue can result depending on the amount of uncorrected error.
Diagnosis
A simple eye chart test will reveal the amount of blur in vision. The eyes are then carefully measured on specialized equipment which gives us an estimate lens power. A trial lens test is performed in the clinic to correct the astigmatism and a prescription can be provided. Measuring the corneal curvature on topography machines will give us a map of the curvature error. The pressure of the eye is taken using numbing drops and a second drop which dilates the pupil is put in also. With the pupil widely dilated, the eye doctor can check the retina, blood vessels, optic nerve and macula.
Treatment
Astigmatism can be corrected with glasses or contact lenses. These are temporary corrective measures. As with other refractive errors, laser eye surgery is a permanent treatment solution but the astigmatism must stabilize first. As a general rule, no increase in script for 1 ½ - 2 years is desireable. Larger amounts of astigmatism may fall out of the treatment range of the laser. Astigmatism due to early keratoconus is usually not treatable with the laser as this will weaken the cornea further.
Outcomes
Generally, laser eye surgery is effective in treating astigmatism. Higher amounts may require a re treatment which is included in the price if performed in the first 12 months.