A gradual change in your vision or long-term (chronic) eye problems may include:
People often tolerate minor eye irritation and problems for a long time, until the irritation or problems become bothersome enough to seek care. People who have skin problems and allergies often have persistent minor problems with the skin of their eyelids and allergic irritation of the eyes.
As people reach their 40s and 50s, it is common to have some vision changes and possibly to need glasses. Some of the changes may also cause other symptoms, like headaches and nausea, that affect a person's ability to function.
If any vision change or eye problem that has come on gradually is getting worse, it is appropriate to see your health professional.
WebMD Medical Reference from Healthwise