exact function of iris
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In humans
➡️Aɴᴅ ᴍᴏsᴛ ᴍᴀᴍᴍᴀʟs ᴀɴᴅ ʙɪʀᴅs, ᴛʜᴇ ɪʀɪs (ᴘʟᴜʀᴀʟ: ɪʀɪᴅᴇs ᴏʀ ɪʀɪsᴇs) ɪs ᴀ ᴛʜɪɴ, ᴀɴɴᴜʟᴀʀ sᴛʀᴜᴄᴛᴜʀᴇ ɪɴ ᴛʜᴇ ᴇʏᴇ, ʀᴇsᴘᴏɴsɪʙʟᴇ ғᴏʀ ᴄᴏɴᴛʀᴏʟʟɪɴɢ ᴛʜᴇ ᴅɪᴀᴍᴇᴛᴇʀ ᴀɴᴅ sɪᴢᴇ ᴏғ ᴛʜᴇ ᴘᴜᴘɪʟ ᴀɴᴅ ᴛʜᴜs ᴛʜᴇ ᴀᴍᴏᴜɴᴛ ᴏғ ʟɪɢʜᴛ ʀᴇᴀᴄʜɪɴɢ ᴛʜᴇ ʀᴇᴛɪɴᴀ.
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It is responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.
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