Eyes and Vision

Computed Tomography (CT) Scan of the Head and Face

A computed tomography (CT) scan uses X-rays to make pictures of the head and face. During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine. Your head will be positioned inside the scanner. The CT scanner sends X-rays through the head. Each rotation of the…

Contact Lens Care

Safety tips and lens care The following tips can help you keep your contacts clean and safe, which will help keep your eyes healthy and your vision as clear as possible. Carefully follow the cleaning instructions for your lenses. Keep your lenses and all supplies very clean. Always wash and rinse your hands thoroughly…

Contact Lens Problems: Hypoxia

Hypoxia occurs when the cornea does not get enough oxygen. It is the most common complication of contact lens wear, especially extended-wear lenses. The cornea has no blood supply of its own, so it gets oxygen only from tears and directly from the atmosphere. A contact lens reduces the oxygen supply to the cornea…

Contact Lens Problems: Infection

Keratitis refers to an inflammation of the cornea . Infection of the cornea is called infectious keratitis. It is the most serious complication of contact lens wear and can cause blindness. Bacterial keratitis is the most common type of infectious keratitis. Overall, bacterial keratitis is among the least frequent…

Contact Lenses

Contact lenses are small plastic or silicone discs shaped to correct refractive errors. After your doctor tests your vision, he or she will write a prescription for the lens you need. Your prescription may change over time. Contacts are placed directly on the eye, where they float on a film of tears in front of the…