A Common Cause of Blurred Vision
If you suffer from blurred vision, the cause may well be a condition known as astigmatism. Astigmatism involved a deformation of the eye’s cornea or lens that interferes with the way light enters the eye, making it impossible for the retina to receive sharp, clear images. This problem can limit your ability to see objects or text, both close up and far away, and the struggle to do may result in eyestrain, headaches and other discomforts. Fortunately, our team at Lone Star Vision can help you overcome astigmatism by diagnosing the exact nature of your condition and prescribing treatment to correct your eyesight.
An eye’s ability to turn light waves into pictures depends in large part on its shape. A normally-shaped eye has a perfectly spherical cornea and and a symmetrically oval lens. This arrangement allows the cornea and lens to work together, refracting and focusing light waves so that the image comes together precisely at the retina on the far end of the eyeball. the retina can then relay this focused image to the brain via the optic nerve. Unfortunately, many eyes lack this perfect shape. Some people’s eyeballs are insufficiently round, which cause the image to overshoot or undershoot the retina; these problems take the form of nearsightedness or farsightedness.
Astigmatism causes or worsen these same issues. In corneal astigmatism, the cornea has eccentricities in its shape, such as bugles or flat spots. These imperfections affect the refraction of the incoming light and causes blurred vision. In lenticular astigmatism, it is the lens that suffers from abnormal curvature, distorting the light rays from that point. If you have astigmatism, you may be both nearsighted and farsighted, with some objects appearing in focus while others remain hopelessly indistinct.
Astigmatism Diagnosis and Treatment at Lone Star Vision in Plano and Celina, TX
Here at Lone Star Vision, we can easily diagnose astigmatism in the course of routine eye testing and vision screening. Simply reading off an eye chart can reveal much to us about the nature of your vision problem. A device called a keratometer measures how your cornea reflects light, calling attention to curvature abnormalities. Digital corneal mapping can then reveal the fine details. We can also measure your eyes’ focusing ability by examining them with a phoropter and retinascope. Armed with all this information, we can then write out a prescription for vision correction that includes a “cylinder” correction (the second number in your prescription) along with corrections for nearsightedness, farsightedness or presbyopia.
Treatment options for astigmatism includes glasses, contact lenses, and laser surgery. Of these, glasses are perhaps the simplest and most affordable route. Ordinary soft contacts don’t usually correct for astigmatism as well as rigid gas-permeable contacts. Another type of contact lens is worn only at night to temporarily reshape the cornea, a process known as Ortho-K. Lasik and PRK surgeries use lasers to permanently correct the shape of the cornea.