Sleeping with contact lenses in place can cause eye dryness and irritation, and may increase the risk of eye infection and eye damage.

Wearing contact lenses can be more comfortable if you clean them regularly. Visual acuity is better as well. Cleaning solutions help to remove dirt and protein deposits from the surface of the lens.

Contact lenses are very safe if worn properly. While contacts are designed to be worn for long periods every day, there are certain times when you should remove them. Contact lenses should be removed before coming into contact with any water, including shower water.

A sore, swollen eyelid is one of the most common presenting complaints at a primary care doctor's office. In addition to feeling self-conscious about their appearance, patients with a sore swollen eyelid will worry that they might have an infection and will be concerned about loss of vision.

Having what appears to be a cloudy film on the eye can interfere with daily tasks and decrease quality of vision. The human eye has many structures than can be affected by conditions that cause symptoms of cloudy vision.

Blocked tear ducts cause excessive tearing and eye irritation when your tears cannot drain normally. Typically, tears drain out of small holes in the corner of your eye, and then pass through tiny tubes into the nose to be eliminated.

Short sightedness, also referred to as nearsightedness and myopia, is an eye defect in which objects in the distance appear blurry while objects that are nearby appear in focus and clear. Nearsightedness is most commonly caused by a misshaped cornea, lens or eyeball.

When a capillary in the white part of the eye bursts -- called a subconjunctival hemorrhage -- the appearance of blood can be rather dramatic and alarming. Often, there is no history of trauma to the eye -- the blood simply appears spontaneously.

Most people get more than enough vitamin B-12 in their diets. It’s found in animal-derived foods, such as milk, yogurt, cheese, beef, eggs and fish, and in most fortified breakfast cereals. But there’s always the potential of developing a deficiency.

Children often have swollen eyelids, commonly caused by trauma, infection and allergies. Because these conditions can be serious, consult your child's pediatrician for an accurate diagnosis and treatment plan to avoid damage to your child's eye or vision.

Tears, which are made up of water, oil, mucus, antibodies and protein, according to the Mayo Clinic, lubricate the eyes and keep them moist. The components of tears are made in glands around the eye; a disturbance in any part of tear production results in dry, gritty, red or irritated eyes.

Keratoconus is a rare vision disorder that affects the shape of the eye. As of early 2011, the cause is unknown. At its worst, the condition causes the cornea to bulge, thin and shape-shift images into barely recognizable blobs. Remedies include corrective vision aids, and as a last resort, corneal transplant.