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Everything about Defocus aberration
Quality of an image being out of focus
In optics, defocus is the aberration in which an image is simply out of focus. In general, defocus reduces the sharpness and contrast of the image. What should be sharp, high-contrast edges in a scene become gradual transitions. Fine detail in the scene is blurred or even becomes invisible. Optically, defocus refers to a translation of the focus along the optical axis away from the detection surface. Nearly all image-forming optical devices, such as cameras, videocameras, microscopes, telescopes, or binoculars, incorporate some form of focus adjustment to minimize defocus and maximize image quality. Wikipedia →
🧭 Start here: a 6-step reading path
- Read the overview: Defocus aberrationA 5-minute orientation
- Skim a recent paper: Visual Acuity, Wavefront Aberrations, and Defocus Curves With an Enhanced Monofocal and a Monofocal Intraocular Lens: A Prospective, Randomized StudyInfluential work since 2022
- Pick up a classic book: Numerical aperture limits on efficient ball lens coupling of laser diodes to single-mode fibers with defocus to balance spherical aberrationThe most-reprinted book on the subject
- Read the landmark paper: Annular apodizers for low sensitivity to defocus and to spherical aberrationCited 95 times
- Go sideways: Circle of confusionA closely related topic
- Go sideways: Contrast transfer functionA closely related topic
📖 Definitions
No dictionary entry for this exact phrase.
🗂️ The subject at a glance
🏆 Landmark papers (most cited)
Annular apodizers for low sensitivity to defocus and to spherical aberration
The eye of the blue acara (Aequidens pulcher, Cichlidae) grows to compensate for defocus due to chromatic aberration
The interactions between chromatic aberration, defocus and stimulus chromaticity: Implications for visual physiology and colorimetry
Spherical Aberration and the Sign of Defocus
The tuning of a Zernike phase plate with defocus and variable spherical aberration and its use in HRTEM imaging
Passive depth estimation using chromatic aberration and a depth from defocus approach
Wavefront coding technique for controlling thermal defocus aberration in an infrared imaging system
On the computation of the nijboer-zernike aberration integrals at arbitrary defocus
🆕 Influential since 2022
Visual Acuity, Wavefront Aberrations, and Defocus Curves With an Enhanced Monofocal and a Monofocal Intraocular Lens: A Prospective, Randomized Study
Analog holographic wavefront sensor for defocus and spherical aberration measurement recorded in a photopolymer
Visual outcomes, contrast sensitivity, and defocus profile with an aspheric monofocal intraocular lens using positive spherical aberration
Multi-curvature compound eye with negative-meniscus substrate for improving imaging defocus and spherical aberration
Defocus Curve and Satisfaction of Patients with Presbyopia After LASIK Using the Differential Modulation of Binocular Longitudinal Spherical Aberration
📚 Books worth reading
- 📕Numerical aperture limits on efficient ball lens coupling of laser diodes to single-mode fibers with defocus to balance spherical aberrationR. Gale Wilson · 1994
Ranked by number of editions on Open Library, a rough measure of how lasting a book is.
🔗 Related topics
- Circle of confusion In optics, a circle of confusion (CoC) is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point…
- Contrast transfer function The contrast transfer function (CTF) mathematically describes how aberrations in a transmission electron microscope (TEM) modify the image of a sample…
- Subjective refraction Subjective Refraction is a technique to determine the combination of lenses that will provide the best corrected visual acuity (BCVA). It is a clinical…
- Astigmatism (optical systems) An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism…
- Peripheral defocus Peripheral defocus is the optical blur that occurs in the peripheral retina of the eye. It is an important factor in eye development and the progression…
- Chromatic aberration In optics, chromatic aberration (CA), also called chromatic distortion, color aberration, color fringing, or purple fringing, is a failure of a lens to…
- Aberrations of the eye The eye, like any other optical system, suffers from a number of specific optical aberrations. The optical quality of the eye is limited by optical aberrations…
- High-resolution transmission electron microscopy High-resolution transmission electron microscopy is an imaging mode of specialized transmission electron microscopes that allows for direct imaging of…