0 a fault in the lens of the eye that reduces the quality of sight, especially a fault that stops the eye from focusing --
Some people have more serious defects—astigmatism and such defects—and have to wear glasses from a very early age, from their twenties right through their lives.
He was asked whether it was not the case when men get wrong glasses that the astigmatism becomes very much worse.
This demonstrates a lack of significant astigmatism.
The images 3a-3c show the far field spot obtained scanning through focus and image 3d shows the improved far field obtained after correction for astigmatism.
Therefore, we introduced a deep deformation of the mirror, pre-correcting a 4l astigmatism aberration, and studied the phase residues at the final distance (36 m) as before.
Based on these measurements, a ' map ' is generated covering the full micrograph that characterises the defocus and astigmatism values over the image.
But such strong astigmatism does not dramatically decrease the spatial resolution of the image and still in both directions the spatial resolution is very high.
These doubts were based upon a fundamental optical phenomenon called astigmatism, which can be described as follows.
