Rathaus
Well-known member
Collmation and eye astigmatism-can eye astigmatism affect perceived collimation?
I tried to change the title in advanced settings but it wouldn't transfer to the forum page. Anyway...
I read somewhere (maybe cloudy nights?) (depending on magnification) about the allowable horizontal, and the more critical vertical convergence. Obviously each brain and eye package will differ re sensitivity and ability to pull everything together.
Question -
Let us assume that perfectly collimated binoculars are in use - Can astigmatism in ones eyeballs (without glasses) give a false looking vertical collimation when casually testing in the usual way...bins six inches to a foot away looking through them at a spire in the distance...or a flat horizontal line in the distance etc?...I'm not just referring to horizontal convergence, but can astigmatism in eyes make one side appear higher or lower? ...or worse - slightly rotate one or both images?
I have other questions but their validity depends on the answer to the above..
Regards
Rathaus
I tried to change the title in advanced settings but it wouldn't transfer to the forum page. Anyway...
I read somewhere (maybe cloudy nights?) (depending on magnification) about the allowable horizontal, and the more critical vertical convergence. Obviously each brain and eye package will differ re sensitivity and ability to pull everything together.
Question -
Let us assume that perfectly collimated binoculars are in use - Can astigmatism in ones eyeballs (without glasses) give a false looking vertical collimation when casually testing in the usual way...bins six inches to a foot away looking through them at a spire in the distance...or a flat horizontal line in the distance etc?...I'm not just referring to horizontal convergence, but can astigmatism in eyes make one side appear higher or lower? ...or worse - slightly rotate one or both images?
I have other questions but their validity depends on the answer to the above..
Regards
Rathaus
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