Word: shape
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...people ever complain about the shape? Do they want triangles like they're used...
...father now myself. My father, for his part, is fourscore years-plus, hasn't missed a game all season on TV and has himself in fine post-season shape for this series against the Yanks. My friend John's father, who lives in Providence, is pretty sick, and has us all praying the Sox do it this year. Another John, in Andover, Mass., lost both his parents in the past few years, so it didn't happen in their lifetimes. But his wife Anne's mother, in Winchester, is going crazy over Pedro, and John and Anne have...
...middle of the iris, or colored part of your eye. Depending on how bright the incoming light is, the pupil grows wider or narrower, much like the adjustable aperture of a camera. The light then passes through the lens, which lies directly behind the iris and changes shape as needed--curving or flattening--to help focus the image onto the retina, the light-sensitive tissue at the back of the eyeball that converts the light into electrical signals. From there, the optic nerve sends these impulses to the brain's optic centers, which create the picture in your mind...
...adds another complication. Most people, as they get older, need reading glasses or bifocals for close work. This condition, called presbyopia, is different from farsightedness because it has nothing to do with the shape of the eye; it happens when the lenses in the eyes lose their ability to curve sufficiently to focus on nearby objects...
...procedure called photorefractive keratectomy. They scaled off the cornea's outermost protective layer, or epithelium. Then they vaporized some of the underlying tissue with the laser, forcing the cornea to flatten or steepen, depending on the correction. Although the epithelium always grew back, the cornea retained its new shape. It was a big improvement over radial keratotomy, although the healing of the epithelium remained painful...