Any opticians or lens people on here - a question.
Discussion
I recently took delivery of a 2nd pair of specs, however I have an issue with them.
I have another pair with identical frames, however on the new (2nd) pair, the lenses are almost flat, but the lenses on the 1st pair are quite curved.
This means the specs sit far forward on my face (as against 'wrapping around' slightly), and I can see the corners of frames in my peripheral vision.
I went back to the opticians and they adjusted the frame but to no avail - they are still the same.... (obviously you can't bend glass lol).
On to my question then!!
Is it cheaper to make flat lenses than curved lenses? (Asking as this 2nd pair were part of an offer and wondered if they were cutting costs...)
Thanks.
I have another pair with identical frames, however on the new (2nd) pair, the lenses are almost flat, but the lenses on the 1st pair are quite curved.
This means the specs sit far forward on my face (as against 'wrapping around' slightly), and I can see the corners of frames in my peripheral vision.
I went back to the opticians and they adjusted the frame but to no avail - they are still the same.... (obviously you can't bend glass lol).
On to my question then!!
Is it cheaper to make flat lenses than curved lenses? (Asking as this 2nd pair were part of an offer and wondered if they were cutting costs...)
Thanks.
TonyRPH said:
I recently took delivery of a 2nd pair of specs, however I have an issue with them.
I have another pair with identical frames, however on the new (2nd) pair, the lenses are almost flat, but the lenses on the 1st pair are quite curved.
This means the specs sit far forward on my face (as against 'wrapping around' slightly), and I can see the corners of frames in my peripheral vision.
I went back to the opticians and they adjusted the frame but to no avail - they are still the same.... (obviously you can't bend glass lol).
On to my question then!!
Is it cheaper to make flat lenses than curved lenses? (Asking as this 2nd pair were part of an offer and wondered if they were cutting costs...)
Thanks.
What you are referring to is called the base curve of the lens, high means more curved, lower (to 0) is flat. You can make most prescriptions in many ways by altering the front and rear curves of the lens. This alters its thickness and curvature but the end rs is the same.I have another pair with identical frames, however on the new (2nd) pair, the lenses are almost flat, but the lenses on the 1st pair are quite curved.
This means the specs sit far forward on my face (as against 'wrapping around' slightly), and I can see the corners of frames in my peripheral vision.
I went back to the opticians and they adjusted the frame but to no avail - they are still the same.... (obviously you can't bend glass lol).
On to my question then!!
Is it cheaper to make flat lenses than curved lenses? (Asking as this 2nd pair were part of an offer and wondered if they were cutting costs...)
Thanks.
Every lens manufacturer has a set of algorithms which takes into account lens size, patient measurements, rx and many more things to generate the lens in its best optical form.
You may have a stock lens (as in already made) in the second pair, so yes a cheaper option to the practice, rather than a surfaced lens (made to order) for the first. Equally it may be that they got the lenses from 2 different places.
Some people are very sensitive to the BC of their lenses some aren't
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