You must have visited an eye care practitioner at least once in your life. The general vision test the practitioner conducted was to deduce if your sight has a refractive error. Refractive error represents the presence of eye shape abnormality, which impacts the eye’s ability to focus light directly onto the retina.
Due to this abnormality, blurred vision is caused, which needs correction by usually wearing the prescribed pair of glasses, contact lenses, or other treatments, including LASIK, refractive surgery, ortho-k, vision therapy, etc.
What is Refractive Error?
Refractive error is an eye-problem related to refraction that helps you see. Usually, the light rays entering your eyes bend or refract through the lens and the cornea and converge or focus on one single point on the retina.
The retina then sends messages (signals) to the brain through the optic nerve. The brain ultimately interprets these signals and converts them into an image of what we are watching. When this doesn’t happen, refractive error takes place.
To correct these refractive errors, it is essential to wear glasses or contact lenses. Wearing glasses from an early age will help correct and restore the vision instead of damaging it more. Here are some of the refractive errors that can occur one at a time or can be multiple simultaneously.
Myopia allows the person to see the objects clearly that are in front of them, but the things present afar are unclear and blurred. This happens because the eyeball is too big, which lets the incoming light fall in front of the retina instead of on it.
Hyperopia is the opposite of myopia. The eyeball, in this case, is smaller than usual. Different people experience hyperopia differently. At times objects placed afar are clear, while other times, people experience blurry near and far vision or face no problems at all. Hyperopia causes eye fatigue and strain when close objects are looked at for extended periods.
Usually, astigmatism occurs due to an irregularly shaped cornea or, sometimes, due to a distorted lens. The typically round cornea becomes round football-shaped in the eye due to astigmatism.
This results in multiple focus points present in front of the retina or behind it (sometimes even both). People who have astigmatism have blurred or distorted vision to some extent, ranging in every distance, whether it is near or far.