If you can "blur your eyes," it generally means you are voluntarily relaxing the ciliary muscles in your eyes that control the shape of the lens, causing the lens to become less curved and the image on your retina to become out of focus. This ability allows you to defocus your vision at will, making objects appear blurry intentionally
. This process is related to the eye's accommodation mechanism, which normally adjusts the lens to focus on objects at different distances. When you relax these muscles, you reduce the lens's focusing power, causing nearby or distant objects to blur depending on the adjustment
. Being able to blur your vision voluntarily is a rare skill and more of a neurological curiosity rather than a sign of any specific visual or health advantage. It can sometimes help reduce visual strain during prolonged close- up work or reading
. In contrast, blurred vision occurring involuntarily or suddenly can be a symptom of various eye conditions or medical issues, such as refractive errors (near-sightedness, far-sightedness, astigmatism), cataracts, glaucoma, retinal problems, or neurological conditions. Such blurred vision usually requires medical evaluation
. In summary, blurring your eyes on purpose means you are consciously controlling your eye muscles to defocus your vision, which is different from blurred vision caused by health problems
