Talk:Aberrations of the eye

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Spherical aberration dependence on pupil size

Is it quadratic or quartic? (i.e. to the second or fourth power?) "...the increase in overall wave aberration with pupil size has been reported to increase to approximately the second power of the pupil radius...The effect of spherical aberration increases as the fourth power of the pupil diameter" That really confused me. Seems like a plain contradiction. If there are contradicting evidence, I think that should be stated explicitly. If that's not a contradiction, it should be explained. Dan Gluck (talk) 10:59, 23 June 2019 (UTC)[reply]

Spherical aberration clinically refers to a fourth-order spherical aberration. This term should not be confused with spherical Zernike polynomials, which are Zernike polynomials with an azimuthal degree of zero. Zernike polynomials are used to mathematically describe various optical aberrations, including defocus, which is a second-order aberration that is mathematically described by a spherical second-order Zernike polynomial. In this clinical context, however, spherical aberration specifically refers to fourth-order spherical aberrations. This distinction helps to clarify the difference in the dependencies on pupil size: overall wave aberration predominantly follows a second-order relationship due to the dominance of second-order aberrations, while spherical aberration follows a fourth-order relationship with pupil diameter. Onawara (talk) 21:05, 3 June 2024 (UTC)[reply]

What is "starburst"?

This appears to be the page that needs to define what "starburst" is as a symptom regarding human vision. [1] "Starbursts, or a series of concentric rays or fine filaments radiating from bright lights, may be caused by refractive defects in the eye." User:力 (power~enwiki, π, ν) 04:15, 25 April 2021 (UTC)[reply]