Lack of clarity of vision in the eye is usually caused by abnormalities in the refractive interstitium, such as keratitis, cataracts, and refractive errors, or by abnormalities in retinal function, such as macular degeneration and retinal detachment. The ability of the eye to see clearly depends on the functioning refractive interstitium and the retina’s ability to recognize optical information. Abnormalities in both of these can cause unclear vision. Abnormalities in the refractive interstitium mainly refer to clouding of the refractive interstitium (e.g., cataracts, keratitis, etc.) and abnormal refractive states, i.e., the inability to focus light rays on the retina, e.g., farsightedness, astigmatism, nearsightedness, and other disorders, which are collectively called refractive errors. Retinopathy, on the other hand, mainly includes macular degeneration and retinal detachment. Feeling that the eyes do not see things clearly, in addition to the above reasons, may also be due to trauma, corneal clouding, hypertension, arteriosclerosis and so on. If you feel that your eyes are not seeing clearly, you must go to a regular hospital in time for a detailed examination to clarify the cause of the disease.