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Razhie. Advicenators Member Since: June 13, 2005. Answers: 5077. Visitors: 211514.
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The Question
I have a box of contact lenses left (from my old prescription) that are -0.25 lower than my current prescription (Older: -1.75; Newer: -2.0)-- I use Acuvue Oasys 2-week lenses. Is it okay to use the older lenses and then switch to the current prescription once those have run out? Will this have any effect on my current prescription?
The Answer
It's not going to change your current prescription to use old lenses. But, you wont be getting the full benefit and vision correction. That can lead to headaches and exhaustion and just general icky feelings. So it's certainly be better to switch to the new ones right away, even tho the old ones wont harm you.
The most important thing is not to switch between the new and old and back again. Once you change to the new, you should never go back to the old. It could make you feel very disoriented and sick.
I really wouldn't recommend using the old lenses for much longer. If you just have 1 or 2 pairs left, that's probably not a big deal, but if you have months and months of them left, just do your eyes the favour and switch to the new.
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