myopia
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Another name for short sight is myopia. Myopia is a condition where a person can see close objects clearly but distant objects appear blurry. It is caused by the eyeball being too long or the cornea being too curved.
Gamma radiation is a form of electromagnetic radiation with a short wavelength and therefore high frequency and high energy per photon. Gamma radiation is also known as gamma rays.
Some examples of nouns that name objects that can be perceived by the senses are: apple (sight, taste, touch), music (hearing), perfume (smell), flower (sight, smell, touch), and velvet (touch).
Ray is generally short for Raymond. I have seen it used as a shortneing for Gary.
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For short-sightedness (myopia), concave lenses are used to diverge light before it reaches the eye, helping to focus the image correctly on the retina. For long-sightedness (hyperopia), convex lenses are used to converge light before it reaches the eye, assisting in bringing the image into focus on the retina.