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The cornea allows light to enter the eye for vision. Here are the basics you should know about this important part of the eye. Cornea Definition The cornea is the clear front surface of the eye. It lies directly in front of the iris and pupil, and it allows light to enter the eye. Cross-section of cornea. Viewed from the front of the eye, the cornea appears slightly wider than it is tall. This is because the sclera (the “white” of the eye) slightly overlaps the top and bottom of the anterior cornea. The horizontal diameter of the cornea typically measures about 12 millimeters (mm), and the vertical diameter is 11 mm, when viewed from the front. But if viewed from behind, the cornea appears circular, with a uniform diameter of approximately 11.7 mm. This makes the cornea about two-thirds the size of a dime. The center thickness of the average cornea is about 550 microns, or slightly more than half a millimeter. The cornea has five layers. From front to back, th...

Have you considered purchasing cheap glasses online? Or maybe you’ve been tempted to buy cheap sunglasses at a mall kiosk…or cheap reading glasses at a discount store? After all, why should you pay hundreds of dollars for prescription eyeglasses when cheap glasses look every bit as good, right? As much as we all want to avoid spending hard-earned money unwisely, deals that seem too good to be true when buying glasses are no different than deals that sound too good to be true when buying anything else — you may save money up front, but the product often doesn’t live up to your expectations. And when it comes to eyewear, some cheap glasses can actually cause harm to your eyes that you’re not even aware of. Cheap Glasses: Buyer Beware Being a wise eyewear consumer requires a little due diligence to understand factors that affect the quality and value of eyeglasses and sunglasses. Here are 10 things to be aware of if you’re considering cheap eyeglasses or sunglasses: Frame...