Your internal and external sphincters are muscles that wrap around your anus and help you control your bowel movements. Some people lose control of their bowel movements and develop a condition called fecal or bowel incontinence.

Eye redness might occur for a number of reasons, including lack of sleep, dry eye, infections or allergies. Once these conditions resolve or you start sleeping well, the redness might dissipate.

Many types of infections can involve your eyes. One of the most common, pink eye, can stem from a virus, bacteria or fungi, and this infection will involve the tissue that covers the white of your eye and underside of your eyelids.

Regular weight lifting exercises may lead to an increase in the risk for eyesight related issues such as glaucoma and eye floaters.

Contact lenses must be handled with care and can only be exposed to the natural fluids in your eyes, eye drops specially designed for contact lenses, and contact solution, according to the Mayo Clinic.

A food allergy is a mistake of the immune system, according to Kids Health. The immune system protects the body from harmful substances, such as viruses and bacteria. During a food allergy reaction, the immune system mistakes the food as a harmful substance and attempts to fight it off.

During an eye exam, the doctor may use a drop that numbs the surface of the eye. These drops may help the doctor check the eye pressure, or the numbing drops may ease pain and discomfort from foreign bodies, allowing the doctor to carefully examine the eye.

Strenuous exercise can make the whites of your eyes turn red. A number of factors can cause the appearance of red eyes, but in nearly all instances the condition is easily treated and resolved. If you develop a severe case of red eyes during or after exercise, speak to your doctor.

Appearing as the black circle in the center of each eye, your pupils serve as the windows through which light enters your eyes. This function is critical as you are able to see only when light rays reach the retinas deep inside your eyes.

The optic nerve is your eye's connection to the brain and is critical to how you process sight. If the optic nerve becomes swollen, vision can be dramatically affected.

Viral infections in the eye may cause your eyes to feel uncomfortable, and some infections may result in blurry vision. Depending on the location and type of infection, your eye doctor may not have a medication to cure your eye infection.

Your eyes converge when you focus on near objects like reading a book, tying your shoe or sending a text message. Convergence insufficiency limits a person’s ability to work with visual information at close distances. Convergence insufficiency can even limit entertainment or leisure activities.