Optician opinion wanted!
Discussion
any opticians in the house?
Long story short, after twnety years of wearing glasses, I have recently tried a couple of different contact lens prescriptions on trial
My vision still isnt as good as with glasses, and despite asking a couple of times, I'm still not convinced I have the correct lenses.
My latest eye test prescription is -
R: -4.00/+1.75x84
L: -2.25/+0.75x63
and the latest trial lenses are -
R: -2.75/-1.25x180
L: -1.50/-0.75x160
I had assumed that the lenses would match the prescription...
If someone could explain to me why the fiures dont match, it woudl be appreciated!
Long story short, after twnety years of wearing glasses, I have recently tried a couple of different contact lens prescriptions on trial
My vision still isnt as good as with glasses, and despite asking a couple of times, I'm still not convinced I have the correct lenses.
My latest eye test prescription is -
R: -4.00/+1.75x84
L: -2.25/+0.75x63
and the latest trial lenses are -
R: -2.75/-1.25x180
L: -1.50/-0.75x160
I had assumed that the lenses would match the prescription...
If someone could explain to me why the fiures dont match, it woudl be appreciated!
Jumpy Guy said:
any opticians in the house?
Long story short, after twnety years of wearing glasses, I have recently tried a couple of different contact lens prescriptions on trial
My vision still isnt as good as with glasses, and despite asking a couple of times, I'm still not convinced I have the correct lenses.
My latest eye test prescription is -
R: -4.00/+1.75x84
L: -2.25/+0.75x63
and the latest trial lenses are -
R: -2.75/-1.25x180
L: -1.50/-0.75x160
I had assumed that the lenses would match the prescription...
If someone could explain to me why the fiures dont match, it woudl be appreciated!
A contact lens prescription is always a different power to a glasses prescription, which explains the first bit (long/short sight). The second bit (astigmatism) is due to a different type of notation, where it will be written down at 90 degrees to the other type, but as a negative. Since contacts aren't custom made, those will be the closest ones to your prescription, and it's possible that 1.25 is the most astigmatism that can be corrected with that brand.Long story short, after twnety years of wearing glasses, I have recently tried a couple of different contact lens prescriptions on trial
My vision still isnt as good as with glasses, and despite asking a couple of times, I'm still not convinced I have the correct lenses.
My latest eye test prescription is -
R: -4.00/+1.75x84
L: -2.25/+0.75x63
and the latest trial lenses are -
R: -2.75/-1.25x180
L: -1.50/-0.75x160
I had assumed that the lenses would match the prescription...
If someone could explain to me why the fiures dont match, it woudl be appreciated!
Is it your right eye giving you the trouble since it's your bad one?
Yes, the right is worse, its hard to focus on books, laptop etc - getting ghosting and swimmy vision
To be honest, its all a bit 'swimmy' for close up vision
long dintance is great, but writing this on the laptop is much worse than with glasses
i had expected the same level of vision as my glasses, is that unrealistic?
To be honest, its all a bit 'swimmy' for close up vision
long dintance is great, but writing this on the laptop is much worse than with glasses
i had expected the same level of vision as my glasses, is that unrealistic?
How old are you?
Contacts have always given superior vision for me but having entered my early 40's as expected my nearfield reading distance has deteriorated so now (and quite suddenly) i find reading trickier with contacts. I have also noticed general vision is slightly worse even though tried a couple of minor changes in prescription for my contacts.
You might need to try a few different types / manufacturers before you find a lens that suits.
Contacts have always given superior vision for me but having entered my early 40's as expected my nearfield reading distance has deteriorated so now (and quite suddenly) i find reading trickier with contacts. I have also noticed general vision is slightly worse even though tried a couple of minor changes in prescription for my contacts.
You might need to try a few different types / manufacturers before you find a lens that suits.
Edited by Digger on Saturday 28th April 18:57
Jumpy Guy said:
Yes, the right is worse, its hard to focus on books, laptop etc - getting ghosting and swimmy vision
To be honest, its all a bit 'swimmy' for close up vision
long dintance is great, but writing this on the laptop is much worse than with glasses
i had expected the same level of vision as my glasses, is that unrealistic?
Go back to the optician and explain - he probably wanted to see if the undercorrection for the astigmatism would work for you (it sometimes does). They are available in the right power though.To be honest, its all a bit 'swimmy' for close up vision
long dintance is great, but writing this on the laptop is much worse than with glasses
i had expected the same level of vision as my glasses, is that unrealistic?
Jumpy Guy said:
Thanks for the advice
one question - what is causing the close up 'swimmy-ness'?
is it the difference in lens power, or the astigmatism?
Likely the astigmatism - try alternating between your left and right eye to see if it makes any difference. If it does, it's the astigmatism.one question - what is causing the close up 'swimmy-ness'?
is it the difference in lens power, or the astigmatism?
Digger said:
How old are you?
Contacts have always given superior vision for me but having entered my early 40's as expected my nearfield reading distance has deteriorated so now (and quite suddenly) i find reading trickier with contacts. I have also noticed general vision is slightly worse even though tried a couple of minor changes in prescription for my contacts.
You might need to try a few different types / manufacturers before you find a lens that suits.
Same here - worn contacts very happily since age 19 - now mid 40s and it's all going a bit downhill! Contacts always have a lower prescription - something to do with the focal point being nearer to the face/eyes?Contacts have always given superior vision for me but having entered my early 40's as expected my nearfield reading distance has deteriorated so now (and quite suddenly) i find reading trickier with contacts. I have also noticed general vision is slightly worse even though tried a couple of minor changes in prescription for my contacts.
You might need to try a few different types / manufacturers before you find a lens that suits.
Edited by Digger on Saturday 28th April 18:57
Manufacturer, water/oxygen content can make tiny but noticeable differences. Eyes have to work harder with contacts - with glasses you tend to move your head.
Have settled for separate reading glasses for wearing over contacts for the laptop etc - love my contacts too much.
For the OP, suggest back to opticians or give it some more time - it does take awhile to get used to them and I know a few people who've given up within weeks rather than stick it out.
Ok lets clear a few things up.
To swap between the two you add the sphere (the first number) to the cylinder (the second number) change the sign of the cylinder and add 90 to the axis (the last number).
So
R: -4.00/+1.75x84
becomes
R: -2.25/-1.75 x 174
and
L: -2.25/+0.75x63
becomes
L: -1.50/-0.75x 154
Mathematically a contact lens needs to be a less powerful negative prescription (rx) than the spectacle lens to allow for the 10mm or so gap between the eye and the spectacle lens. Those who are long sighted will have a more positive cl rx than a glasses rx.
Generally you change a cl rx from a spectacle rx where the prescription is over +- 4. So here you wouldn't really bother.
You can get -1.75 cyl toric soft lenses so this could be altered for the R and then the -2.75 could be reduced to -2.25.
Age plays a part for NV. You can move your glasses or take them, look under/over them to help you read. You can't with a contact lens.
Now this isn't something to take and wave under your optoms nose as to what isn't right with the lenses, its simply a very brief run through of how they are worked out. There are lots of reasons why toric soft lenses may or may not work. Most do and very well.
Hope it helps.
Jumpy Guy said:
R: -4.00/+1.75x84
L: -2.25/+0.75x63
and the latest trial lenses are -
R: -2.75/-1.25x180
L: -1.50/-0.75x160
These are surprisingly similar. Its called transposition - you can have a prescription in plus cyl (the first one) or minus cyl (the second).L: -2.25/+0.75x63
and the latest trial lenses are -
R: -2.75/-1.25x180
L: -1.50/-0.75x160
To swap between the two you add the sphere (the first number) to the cylinder (the second number) change the sign of the cylinder and add 90 to the axis (the last number).
So
R: -4.00/+1.75x84
becomes
R: -2.25/-1.75 x 174
and
L: -2.25/+0.75x63
becomes
L: -1.50/-0.75x 154
Mathematically a contact lens needs to be a less powerful negative prescription (rx) than the spectacle lens to allow for the 10mm or so gap between the eye and the spectacle lens. Those who are long sighted will have a more positive cl rx than a glasses rx.
Generally you change a cl rx from a spectacle rx where the prescription is over +- 4. So here you wouldn't really bother.
You can get -1.75 cyl toric soft lenses so this could be altered for the R and then the -2.75 could be reduced to -2.25.
Age plays a part for NV. You can move your glasses or take them, look under/over them to help you read. You can't with a contact lens.
Now this isn't something to take and wave under your optoms nose as to what isn't right with the lenses, its simply a very brief run through of how they are worked out. There are lots of reasons why toric soft lenses may or may not work. Most do and very well.
Hope it helps.
Edited by DKL on Saturday 28th April 23:01
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