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Astigmatism, explained by RP Photonics Encyclopedia; aberration…
- https://www.rp-photonics.com/astigmatism.html#:~:text=Astigmatism%20is%20one%20of%20the%20classical%20types%20of,under%20a%20substantial%20angle%20against%20the%20optical%20axis.
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Astigmatism Definition & Meaning - Merriam-Webster
- https://www.merriam-webster.com/dictionary/astigmatism
- 1 : a defect of an optical system (as a lens) causing rays from a point to fail to meet in a focal point resulting in a blurred and imperfect image. 2 : a defect of vision due to astigmatism of the refractive system of the eye and especially to corneal irregularity — compare emmetropia, myopia.
Definition of astigmatism - iDigitalPhoto Dictionary
- http://www.idigitalphoto.com/dictionary/astigmatism
- astigmatism Definition: Optics and optometrics: aberration of optical system which causes image detail in one axis to focused at a different plane from image detail in another e.g. a spoked carriage wheel can have its spokes rendered sharp but not the wheel rim, or the rim can be sharp but the spokes will be out of focus.
Astigmatism | National Eye Institute
- https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/astigmatism
- Astigmatism is a common eye problem that can make your vision blurry or distorted. It happens when your cornea (the clear front layer of your eye) or lens (an inner part of your eye that helps the eye focus) has a different shape than normal. The only way to find out if you have astigmatism is to get an eye exam.
Astigmatism - Symptoms and causes - Mayo Clinic
- https://www.mayoclinic.org/diseases-conditions/astigmatism/symptoms-causes/syc-20353835
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In photography, what is lens astigmatism? - Quora
- https://www.quora.com/In-photography-what-is-lens-astigmatism
- Usually, astigmatism is calculated by the difference between the image position of the meridional rays to the image position of the meridional rays. Of course, there is many more rays in between, but those are the two extremes so it makes sense to compare those two. Now what does this do in photography?
Astigmatism (Photography) - Definition - Lexicon & Encyclopedia
- https://en.mimi.hu/photography/astigmatism.html
- Astigmatism One of the more complicated aberrations to describe, astigmatism is similar in concept to coma and is caused by rays entering the lens along the sagittal plane being focused at a different point than rays along the tangential plane. This causes distortion along the edges and in the corners of an image. [>>>]
What Is Astigmatism? Symptoms, Causes, Diagnosis, …
- https://www.aao.org/eye-health/diseases/what-is-astigmatism
- Astigmatism is caused by an irregular curvature of the eye's cornea or lens. If your cornea or lens isn't evenly curved, light rays aren't refracted properly. With astigmatism you have blurred or distorted vision at near and far distances. Astigmatism is very common. Doctors don't know why corneal or lens shape differs from person to person.
Astigmatism, explained by RP Photonics Encyclopedia; …
- https://www.rp-photonics.com/astigmatism.html
- Astigmatism is one of the classical types of optical aberrations which are experienced in imaging systems. It occurs, for example, when light hits a spherical optical lens or a spherically curved mirror under a substantial angle against the optical axis.
astigmatism | Definition & Treatment | Britannica
- https://www.britannica.com/science/astigmatism-eye-disorder
- astigmatism, nonuniform curvature of the cornea (the transparent, dome-shaped tissue located in front of the iris and pupil) that causes the eye to focus images at different distances, depending on the orientation of light as it strikes the cornea.
What are Lens Aberrations? (And How This Affects Your …
- https://expertphotography.com/lens-aberrations-photography/
- The light entering at the edges of a lens refracts more than light entering in the middle. Light entering from the edges hits the optical axis at a different point than light entering in the centre. This creates a soft-focus look called a spherical aberration. Sony has added specially shaped elements to its lens to reduce spherical aberration.
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