Vision issues in one eye may only be temporary, depending on the source. It is possible to correct this by wearing glasses in one eye to assist the weaker eye. If you believe you have a lazy eye yet your vision appears to be deteriorating in one eye, you may have a refractive defect such as myopia. In these cases, it is best to consult with an ophthalmologist so that proper treatment can be initiated. If one eye is blind or severely damaged, it may be advisable to wear corrective lenses no matter how serious the case may appear to be. Wearing glasses or contacts can help prevent further damage to the remaining eye and allow it have a better chance of healing. Even if you have perfect vision in both eyes, it is still important to wear sunglasses to protect your eyes from the sun's harmful rays. Eyeglasses are devices worn over the eye to correct visual defects such as nearsightedness (myopia), farsightedness (hypermetropia) and astigmatism. Additionally, they can be used to enhance one's appearance by changing the color or shape of the lens. Eyeglasses are made of various materials including steel, plastic and wood. The two main types of glasses are rigid and soft. Rigid glasses are curved along their entire edge, while soft glasses have a flexible side for mounting the frame.