Hello,
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It depends on your eye sight. Your eye sight must be 3.5 on each test i.e, short sight and long sight must be equal.
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You will be tested with the word reading, by adjusting on both the long sight and short sight.
If you are able to read with or without spectacles, you are eligible for army.
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If you sight is more then 3.5 then you aren't Eligible for army. So before joining test your sight and see that doesn't increase to maximum. Best of luck