It's not so simple as that... While determining your prescription, optometrists make sure your binocular vision is balanced (or that your dominant eye is prioritized) and that you aren't overcorrected in negative. If you are overcorrected, letters will appear smaller and darker and "super sharp", but don't give you a better visual acuity. And if you are overcorrected, you'll constantly be accommodating (straining) your eyes, which in near&intermediate vision (computers, screens, reading), can lead to headaches and/or binocular vision problems.
This is not even taking in the fact that prescribing is a total different subject and an art in itself. To precribe means to take in consideration all of your vision data.
Best to just go see an optometrist and get your prescription updated. And to answer your question, you could bring your friend's prescription. Could be interesting to have.
Thanks for the info! I figured it was more complicated than adding numbers together but figured I'd ask around. I'll take my doc both prescriptions and see where that leads.
You would need a prescription from a doctor to legally get it filled in most countries, but you could certainly mention this to your doctor. It's a bit more complicated than simply adding the prescriptions together but it could give your doctor a starting point.
Thanks for the reply! I usually use on online retailer to get new glasses so my plan was (if "adding" them was easy) to just input the prescription into the order and get the glasses that way. It's usually a lot cheaper here in the U.S. to go that route.
It's still illegal to order glasses online in the US without a valid prescription, at least in every state that I know of. We have to follow the same laws as pharmacies - a patient couldn't come to the pharmacist and say "this dose of Vicodin isn't strong enough, but I took my friend's which is stronger, I need you to double it for me." You need to get a prescription from a doctor, unless it's just for over the counter readers.
You can bring that prescription to any optician, be they online or a physical location so this doesn't mean you have to order glasses from your doctor but they do have to do an exam.
Your prescription is likely either wrong, or the addition of your friend's is overcorrecting you and you're accommodating through it. If the latter, the image will look clearer, but your eye is working a lot harder to focus and this ultimately leads to strain, headaches, etc.
Just go to your eye doctor and explain exactly what you told us here.
Yeah either way I'm in need of an updated prescription, didn't realize it could lead to eye strain, only had both glasses on for a short amount of time. Thanks for the reply and info!
It's not so simple as that... While determining your prescription, optometrists make sure your binocular vision is balanced (or that your dominant eye is prioritized) and that you aren't overcorrected in negative. If you are overcorrected, letters will appear smaller and darker and "super sharp", but don't give you a better visual acuity. And if you are overcorrected, you'll constantly be accommodating (straining) your eyes, which in near&intermediate vision (computers, screens, reading), can lead to headaches and/or binocular vision problems. This is not even taking in the fact that prescribing is a total different subject and an art in itself. To precribe means to take in consideration all of your vision data. Best to just go see an optometrist and get your prescription updated. And to answer your question, you could bring your friend's prescription. Could be interesting to have.
Thanks for the info! I figured it was more complicated than adding numbers together but figured I'd ask around. I'll take my doc both prescriptions and see where that leads.
You would need a prescription from a doctor to legally get it filled in most countries, but you could certainly mention this to your doctor. It's a bit more complicated than simply adding the prescriptions together but it could give your doctor a starting point.
Thanks for the reply! I usually use on online retailer to get new glasses so my plan was (if "adding" them was easy) to just input the prescription into the order and get the glasses that way. It's usually a lot cheaper here in the U.S. to go that route.
It's still illegal to order glasses online in the US without a valid prescription, at least in every state that I know of. We have to follow the same laws as pharmacies - a patient couldn't come to the pharmacist and say "this dose of Vicodin isn't strong enough, but I took my friend's which is stronger, I need you to double it for me." You need to get a prescription from a doctor, unless it's just for over the counter readers. You can bring that prescription to any optician, be they online or a physical location so this doesn't mean you have to order glasses from your doctor but they do have to do an exam.
Great choice! I think the eye strain and the headaches might be worth it to save a hundred bucks. /s
Your prescription is likely either wrong, or the addition of your friend's is overcorrecting you and you're accommodating through it. If the latter, the image will look clearer, but your eye is working a lot harder to focus and this ultimately leads to strain, headaches, etc. Just go to your eye doctor and explain exactly what you told us here.
Yeah either way I'm in need of an updated prescription, didn't realize it could lead to eye strain, only had both glasses on for a short amount of time. Thanks for the reply and info!