Question

discuss in detail about central retina​

Answer 1

Answer:

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A circular field of approximately 6 mm around the fovea is considered the central retina while beyond this is peripheral retina stretching to the ora serrata, 21 mm from the center of the retina (fovea). The total retina is a circular disc of between 30 and 40 mm in diameter (Polyak, 1941; Van Buren, 1963; Kolb, 1991).

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Answer 2

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ᴄᴇɴᴛʀᴀʟ ʀᴇᴛɪɴᴀ ɪs ᴄᴏɴᴇ-ᴅᴏᴍɪɴᴀᴛᴇᴅ ʀᴇᴛɪɴᴀ ᴡʜᴇʀᴇᴀs ᴘᴇʀɪᴘʜᴇʀᴀʟ ʀᴇᴛɪɴᴀ ɪs ʀᴏᴅ-ᴅᴏᴍɪɴᴀᴛᴇᴅ. ᴛʜᴜs ɪɴ ᴄᴇɴᴛʀᴀʟ ʀᴇᴛɪɴᴀ ᴛʜᴇ ᴄᴏɴᴇs ᴀʀᴇ ᴄʟᴏsᴇʟʏ sᴘᴀᴄᴇᴅ ᴀɴᴅ ᴛʜᴇ ʀᴏᴅs ғᴇᴡᴇʀ ɪɴ ɴᴜᴍʙᴇʀ ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇ ᴄᴏɴᴇs.ʀᴏᴅs ᴀʀᴇ ʟᴏᴄᴀᴛᴇᴅ ᴛʜʀᴏᴜɢʜᴏᴜᴛ ᴛʜᴇ ʀᴇᴛɪɴᴀ; ᴄᴏɴᴇs ᴀʀᴇ ᴄᴏɴᴄᴇɴᴛʀᴀᴛᴇᴅ ɪɴ ᴀ sᴍᴀʟʟ ᴄᴇɴᴛʀᴀʟ ᴀʀᴇᴀ ᴏғ ᴛʜᴇ ʀᴇᴛɪɴᴀ ᴄᴀʟʟᴇᴅ ᴛʜᴇ ᴍᴀᴄᴜʟᴀ. ᴀᴛ ᴛʜᴇ ᴄᴇɴᴛᴇʀ ᴏғ ᴛʜᴇ ᴍᴀᴄᴜʟᴀ ɪs ᴀ sᴍᴀʟʟ ᴅᴇᴘʀᴇssɪᴏɴ ᴄᴀʟʟᴇᴅ ᴛʜᴇ ғᴏᴠᴇᴀ. ᴛʜᴇ ғᴏᴠᴇᴀ ᴄᴏɴᴛᴀɪɴs ᴏɴʟʏ ᴄᴏɴᴇ ᴘʜᴏᴛᴏʀᴇᴄᴇᴘᴛᴏʀs ᴀɴᴅ ɪs ᴛʜᴇ ᴘᴏɪɴᴛ ɪɴ ᴛʜᴇ ʀᴇᴛɪɴᴀ ʀᴇsᴘᴏɴsɪʙʟᴇ ғᴏʀ ᴍᴀxɪᴍᴜᴍ ᴠɪsᴜᴀʟ ᴀᴄᴜɪᴛʏ ᴀɴᴅ ᴄᴏʟᴏʀ ᴠɪsɪᴏɴ.

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