10/30/2022 0 Comments Scratch on eyeLight sensitivity soon follows and can be so intense that the eye can involuntarily shut. That’s why its important to carefully investigate the cause of every corneal scratch.Ī scratch pr abrasion usually produces near instantaneous pain and tearing as the eye tries to wash away the irritant. Scratches can also be caused by foreign objects that get into the eye and then work their way on to the inside of the upper lid – causing a scratch that occurs with each blink. Tiny infant fingers and fingernails are a common cause of abrasions in young parents, tree branches are a frequent source of abrasions in hikers and lovers of the outdoors, and makeup brushes are a typical cause in women. The most common causes of corneal scratches are accidents. The outermost layer, the epithelium, is designed to break away to protect the delicate deeper layers if scratched or abraded. A healthy cornea is transparent and consists of several layers that give the cornea its smooth dome like shape. Even the smallest piece of dust that finds its way into the eye and touches the cornea can cause significant discomfort, irritation and copious tearing in an attempt to wash it away. It then passes through the crystalline lens and on to the retina where it is transformed into electrical impulses that are ultimately transformed by the brain into sight.īecause vision is so essential for survival and the cornea so critical to seeing, it is among the most richly innervated and exquisitely sensitive of all tissues. Its primary job is to surface the tears and with them, focus light into the eye. So what exactly is the cornea and why can even a small scratch hurt so much? The cornea is the clear dome at the very the front of the eye. Call it a scratch, an abrasion or erosion no matter how you describe it or what the cause, damage to the cornea most always causes pain.
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