Word: lensed
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Amid the hype and hoopla that usually enliven its annual meetings in a vast warehouse at Needham, Mass., Polaroid Corp. last week pulled a few more rabbits from its seemingly bottomless hat of technological tricks. President William McCune Jr. showed off a new SX-70 camera that uses ultrasonic waves...
Beneath a small honeycombed disc on the front of the camera is a thin, gold-coated plastic foil diaphragm that acts as both transmitter and receiver of sound. The diaphragm emits a millisecond "chirp" that bounces back from the object aimed at and, in a series of steps that take...
As the eye of greed seals the fate of Mother Courage, the lens of the telescope determines the destiny of Galileo. Apart from Socrates' drinking the hemlock, the most vivid martyrdom of truth in the memory of civilized Western man is Galileo's recantation before the Italian Inquisition...
...outside world do not focus precisely on the retina but rather in front of it, either because the eyeball is too long or because the cornea and lens bend light rays too much. Just as orthodontists use braces to correct the position of crooked teeth, orthokeratologists employ hard contact lenses to alter the curvature of the cornea to improve vision. At least 300 optometrists now specialize in "ortho-k," and tens of thousands of Americans are believed to have undergone the increasingly popular treatment...
...usually treated with a standard contact lens worn for up to 16 hours a day. Either through pressure or undetermined factors-the cause is still disputed -the cornea does seem to flatten out. After about six weeks the cornea's new curvature is measured, and new contact lenses prescribed, usually with a flatter curve. During the therapy, which can last two years and cost $1,500 and up, the patient may be obliged to wear more than half a dozen pairs of lenses. When the optimal curvature and vision are reached, the patient is assigned the final minimum prescription...