Nearsightedness, also known as myopia, is a condition where you can see objects close to you clearly, but objects farther away appear blurry. For example, you may have to sit closer to the television in order to see it better.
Myopia occurs when your eyeball is too long or your cornea (the clear cover in front of the eye) is too curved. This causes the light rays entering your eye to focus in front of the retina, making distant objects appear blurry. When someone has both cataracts and myopia at the same time, objects look blurry, especially when they are far away.1
Most people are diagnosed with myopia when they are children. Family history is the biggest factor in whether you will have the condition.2
Myopia is usually corrected with prescription eyeglasses or contact lenses, which adjust for the elongated shape of the eye so people with myopia can see far away objects clearly.1
1. National Eye Institute Staff. Nearsightedness. National Eye Institute. https://nei.nih.gov/healthyeyes/myopia.
2. Canadian Ophthalmological Society Staff. Near-Sightedness (Myopia). Canadian Ophthalmology Society. Available at http://www.cnib.ca/en/your-eyes/eye-conditions/near-sightedness/Pages/default.aspx.