An eye twitch stems from an involuntary muscle spasm in the upper or lower eyelid. Mild but persistent eyelid spasms may be linked to fatigue, stress, dry eyes or excess caffeine intake — and countering these may help stop the twitch.

The sacroiliac joint is where the auricular surface of the sacrum connects with the pelvis. Sacroiliac joint weakness can account for many complaints regarding low back pain.

Excessive blinking is not normal, but in most cases, the cause is not serious. Eye irritation or strain, or temporary, repetitive behaviors are common causes. Infrequently this blinking is due to an ongoing condition that requires evaluation.

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.

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.

Good blood circulation in the eyes is vital to maintain adequate eye health. Healthy circulation can be improved and maintained by using eye exercises and massage, maintaining a healthy diet and taking certain medications or supplements if necessary.

As people age, the lenses of their eyes lose flexibility. This condition is called presbyopia, and it makes close-up objects appear blurry.

With time and gravity, your eyes appear less youthful and vibrant. Crow's feet form, dark circles develop, eyelids droop and under eye hollows appear. You can opt for invasive orbital rim implants or purchase a number of costly products claiming to reduce these issues.

A boxing speed bag is a great tool for teaching boxing and it is also a wonderful cardiovascular tool. Many boxers and non-boxers love working on the speed bag because success on the bag indicates quickness and excellent hand-eye coordination. It's fairly easy to hang a speed bag in your basement or workout area.

The term "lazy eye" describes a problem between neural pathways in the brain and eye that result in a loss of vision. Lazy eye exercises for adults are designed to strength the ocular muscles in an effort to correct a lazy eye.

If your eyes swell after exercise, you need to see a physician, especially if you have other symptoms such as trouble breathing or hives. You may be suffering from a literal allergy to exercise, a condition that can proceed rapidly to a serious allergic reaction, according to the University of Maryland Medical Center.