Zernike Polynomial Demonstration (Clinical Ophthalmology)

These can be abstract but here is a quick video showing how to translate the concepts to clinical reality.

[@EyeFlyMD]

I don't like the way I phrased "Piston." It's expressed in wavelengths of the wavelength of light and is essentially linear phaseshift, or where in the phase the wavelength encounters the retina essentially. It is analogous to moving the muscle light closer to and farther from the wall as above but I wanted to clarify further. As you can see, this is not clinically relevant though as point in phase doesn't affect the quality of the image.

[@akatsuki6371]

I hate theory without demonstrations. Thank you very helpful

[@santiagoblandon3022]

Refractive surgery victim here. I really liked the trefoil demonstration because of how tilting the lens made one lobe converge and the others diverge is very similar to how it looks when trying to accommodate with trefoil on your own eye. I have a question: Why do we see discrete spokes of light and not a halo when looking at point lights having post CRS aberrations? Also, I wanna mention that the halo I see around things, with high contgrast things I can tell it's actually multiple images ghost images surrounding the main image. Also the ghosts distance from the main image is directly related to the aperture of the pupil, and there is an array of fainter ghost images up until the main ghost. Is it because the brain erases them, or is it like a function with maxima and minima where the maxima are what the brain picks up as images?

[@Odank]

I understand spherical abberation and how it is one of the easier for people to accomodate to (if within certain limits), but can you elaborate on Focus? Where does this come from - and how can it be manipulated if at all in a surgery? Can people with higher amounts of the have an inability to focus on a certain plane or is there a shifting that is unstable? Thanks for any input on this.