Question

deffect of eye and their remadiee
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Answer 1

The range of distinct vision of a normal eye extends from 25 cm. beyond the eye to infinity. That is to say that a normal eye can form clear image on the retina of an object lying anywhere within this range. Such an eye is called emmetropic eye. However there are some common defects of eye which are:

Presbiopia or farsightedness

Hypermetropia or longsightedness

Myopia or shortsightedness

Astigmatism

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Answer 2

Answer

ᴛʜᴇʀᴇ ᴀʀᴇ ᴍᴀɪɴʟʏ ᴛʜʀᴇᴇ ᴄᴏᴍᴍᴏɴ ʀᴇғʀᴀᴄᴛɪᴠᴇ ᴅᴇғᴇᴄᴛs ᴏғ ᴠɪsɪᴏɴ. ᴛʜᴇsᴇ ᴀʀᴇ ᴏɴᴇ ᴍʏᴏᴘɪᴀ ᴏʀ ɴᴇᴀʀsɪɢʜᴛᴇᴅɴᴇss ᴛᴡᴏ ʜʏᴘᴇʀ ᴍᴇᴛʀᴏᴘɪᴀ ᴏʀ ғᴏᴜʀ sɪɢʜᴛᴇᴅɴᴇss ᴀɴᴅ ᴛʜʀᴇᴇ ᴘʀᴇsʙʏᴏᴘɪᴀ ᴛʜᴇsᴇ ᴅᴇғᴇᴄᴛs ᴄᴀɴ ʙᴇ ᴄᴏʀʀᴇᴄᴛᴇᴅ ʙʏ ᴛʜᴇ ᴜsᴇ ᴏғ sᴜɪᴛᴀʙʟᴇ sᴘʜᴇʀɪᴄᴀʟ ʟᴇɴsᴇs ᴡᴇ ᴅɪsᴄᴜssᴇᴅ ʙᴇʟᴏᴡ ᴛʜᴇsᴇ ᴅᴇғᴇᴄᴛs.