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The specific cause of astigmatism is unknown. It can be hereditary and is usually present from birth. It can decrease or increase over time. - American Optometric Association You might've had it since birth but without noticeable defect and has progressed rapidly enough to produce a defect in your vision during your early 20's. Other factors that would ...


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There are a couple variables, let me explain. An ulcer itself is not contagious. It is just an open sore that won't heal properly. What exactly causes an ulcer to occur needs to be determined by a physician. Contact lense wearers and individuals whom scratch the cornea are more susceptible to ulcers and bacterial issues. The short answer is no the ulcer is ...


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