Red eye—a condition in which the sclera turns red or "bloodshot."—is a frequent eyesight problem. A warm or cool compress typically works.

Night vision and reading difficulties are early symptoms of vision problems. Night blindness (nyctalopia) is difficulties seeing at night or in dim light.

Allergies cause most itchy eyes. It could also indicate an airborne irritation, inflammation, or dry eye. Avoid eye rubbing regardless of the cause.

Are you colorblind? The most common form of color blindness makes red and green difficult to differentiate. Consult an eye doctor if unsure.

Depending on your age, risk factors, and eyeglass or contact lens use, most eye doctors recommend a full eye checkup every one to two years.

Eye exams should be done annually for everyone over 60. High blood pressure, diabetes, or a family history of eye illness make these checkups more critical.