Huge farsightedness/nearsightedness lens

[karl131]

Hello guys,

I have a question for optics experts, is there any possibility to produce a farsightedness/nearsightedness lens in big dimmensions, without distorting the obsjects or anything else you watch through that lens.

Thank you!

 

[berkeman]

How big are the dimensions you have in mind? And you want one lens to work for both eyes at once? That might be pretty challenging. How much distortion and chromatic aberration is acceptable? How much correction (in diopters) do you want to provide?

https://en.wikipedia.org/wiki/Corrective_lens

 

[Drakkith]

I have a question for optics experts, is there any possibility to produce a farsightedness/nearsightedness lens in big dimmensions, without distorting the obsjects or anything else you watch through that lens.

If we take 'without' distortions to mean 'minimized' distortions and other aberrations, then the answer is probably yes. But the better question is how expensive, large, and complicated will it be? If your lens is absolutely massive, it will be too large to be of any use at all.

 

[Andy Resnick]

Hello guys,

I have a question for optics experts, is there any possibility to produce a farsightedness/nearsightedness lens in big dimmensions, without distorting the obsjects or anything else you watch through that lens.

Thank you!

I'm not entirely sure what you mean, but I often use binoculars and microscopes without my glasses on by adjusting the eyepiece(s) to compensate- so, yes?

 

[karl131]

I'm not entirely sure what you mean, but I often use binoculars and microscopes without my glasses on by adjusting the eyepiece(s) to compensate- so, yes?

I mean making a lens in order to cover a window of 120x60 cm. Thank you!

 

[berkeman]

I mean making a lens in order to cover a window of 120x60 cm. Thank you!

How much distortion and chromatic aberration is acceptable? How much correction (in diopters) do you want to provide?

 

[tech99]

I think the only approach would be the Fresnel lens, which is flat, and uses fine grooves shaped as prisms.

 

[sophiecentaur]

I mean making a lens in order to cover a window of 120x60 cm. Thank you!

You would need to keep your head in a fixed position. That could reduce the effectiveness compared with regular varifocal glasses.
Varifocals produce crazy geometrical distortions which take some getting used to. But, after only a few hours, the brain copes well.
The device would need to be specific to the personal prescription so where would be the advantage over normal varifocals?

 

[sophiecentaur]

I often use binoculars and microscopes without my glasses on by adjusting the eyepiece(s) to compensate-

You're lucky. I have astigmatism in both eyes and when I try looking through binos without specs, the result is very unsatisfactory. It's the same problem with a telescope eyepiece - but only on one axis.

I guess contact lenses would solve the problem but I've tried other people's (disposable) lenses and it's total agony. I must say, conventional glasses have suited me well for nearly seventy years and optical astro doesn't suit my inherent cataracts these days.

 

[Andy Resnick]

You're lucky. I have astigmatism in both eyes and when I try looking through binos without specs, the result is very unsatisfactory. It's the same problem with a telescope eyepiece - but only on one axis.

I guess contact lenses would solve the problem but I've tried other people's (disposable) lenses and it's total agony. I must say, conventional glasses have suited me well for nearly seventy years and optical astro doesn't suit my inherent cataracts these days.

Interesting point- I also have astigmatism, maybe it's not as bad as yours so I don't notice it. I can't wear contact lenses anymore, either... :(

 

[sophiecentaur]

Interesting point- I also have astigmatism, maybe it's not as bad as yours so I don't notice it. I can't wear contact lenses anymore, either... :(

My astigmatism is not really too bad but the effect on stars and small writing is just so annoying that it takes the pleasure away if I observe without my specs.