Generally speaking, a low level of calcium may cause problems to some other part of the human body such as bones, blood pressure and have not very much side effect on the eyes. However, if the level of calcium is too high, it may deposit in the eyes and lead to several eye problems. The deposits of calcium can form in three different places in the eye and cause correspondent eye diseases, that is, in the cornea, conjunctiva and retina. The cornea will exhibit calcium deposits in a condition known as band keratopathy that block the blood vessels in the eyes. The conjunctiva will exhibit calcium deposits in the form of concretions which will lead to the degeneration of cells in the conjunctiva. And the deposit of calcium in the retina can lead to calcific plaques in the retinal arteries through which the plaque is transported until it reaches an artery that is too small for it to pass through and becomes lodged in the wall of that artery.And if the artery is large enough, it can cause vision loss. Therefore, you had better consult your doctor to decide what amount of calcium you can take in everyday in case of causing any discomfort.