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retina Dictionary Terms

depth perception
The direct appreciation of the distance between a given object and the observer, or between the front and back of a solid...
mesopic vision
Vision at intermediate levels of luminance between photopic and scotopic vision, where both retinal cones and retinal rods...
vitreous humor
The transparent fluid that fills the portion of the eye between the eye lens and the retina (the posterior chamber).
erect image
An image, real or virtual, whose spatial orientation is identical to that of the object. The image obtained at the retina...
reflectance confocal microscopy
Reflectance confocal microscopy (RCM) is a non-invasive imaging technique that allows for high-resolution, in vivo imaging...
horopter
The locus of the points in the field of binocular vision that are observed singly. The images of these points correspond to...
retinal reflectometry
The study of the quality of the image formed on the retina by the measurement of the flux reflected from the eye when the...
biostimulation
The action of a biological system responding to a single or multiple coherent particles of light produced from a laser...
alexandrite lasers
An alexandrite laser is a solid-state laser that utilizes a synthetic crystal made from the rare earth element alexandrite...
blind spot
The spot on the retina where the optic nerve is attached; it is incapable of sensing light because of the absence of light...
retinography
The process of photographing the retina of the eye.
hyperopia
A vision defect commonly referred to as farsightedness. Results when the image of a distant object is focused beyond the...
time-lapse optical coherence tomography
Time-lapse optical coherence tomography (OCT) refers to a medical imaging technique that captures a series of sequential OCT...
fovea
The central portion of the retina that has the greatest sensitivity to form and color.
optical coherence tomography imaging system
Optical coherence tomography (OCT) is an imaging technique used in medical diagnostics and biomedical research to obtain...
telescope
An afocal optical device made up of lenses or mirrors, usually with a magnification greater than unity, that renders distant...
myopia
A vision defect commonly referred to as nearsightedness. The defective condition results when the image of a distant object...
cone
1. A solid figure whose base is a circle and whose sides taper upward evenly to a point or apex. Light rays diverging from...
stereoscopic photography
The photographing of a scene from positions corresponding to the locations of both eyes. A viewing device is used to present...
perimetry
The analysis of retinal zones in which different hues can be detected. Also called campimetry.
virtual retinal display
The use of miniature scanners to project raster-scanned video images directly onto the surface of the human retina,...
retina camera
A special-purpose camera used by ophthalmologists to photograph the retina of the eye. The optical system operates through...
scotopic vision
Vision by means of retinal rods; vision of the dark-adapted eye. In scotopic vision, the level of luminance is so low that...
eye-safe laser operation
Wavelengths between 400 and 1400 nm (VIS to NIR) are focused onto the retina by the cornea. Because the retina is sensitive...
macula lutea
The small central portion of the human retina that is responsible for providing the clearest, and most distinct aspects of...
visual axis
An imaginary line between the object, through the nodal point of the eye, and the fovea, or point of finest retinal acuity.
ophthalmoscopy
Also referred to as fundus photography, ophthalmoscopy is the dioptrical study of the various interior components of the eye...
adaptive optics
Adaptive optics (AO) is a technology used to improve the performance of optical systems by reducing the effects of...
veiling brightness
A brightness, superimposed on the image of the retina, that decreases its contrast and that often results in decreased...
optical coherence tomography
Optical coherence tomography (OCT) is a non-invasive imaging technique used in medical and scientific fields to capture...
micro-optical coherence tomography
Micro-optical coherence tomography (micro-OCT) is an imaging technique that is an adaptation of optical coherence tomography...
ophthalmic instruments
A family of specialized instruments used by ophthalmologists and optometrists to study a patient's eyes and prescribe...
eye test apparatus
Instruments used by ophthalmologists and optometrists to study the eye. There are, for instance, the ophthalmoscope to...
rod
The light-sensitive cells on the retina of the eye that are responsible for low-resolution, peripheral vision.
ospin
Opsins are a group of light-sensitive proteins found primarily in the retinas of vertebrate and invertebrate eyes, as well...
ophthalmology
Ophthalmology is a branch of medicine that focuses on the anatomy, physiology, and diseases of the eyes and visual system....
visible spectrum
That region of the electromagnetic spectrum to which the retina is sensitive and by which the eye sees. It extends from...
spectral domain optical coherence tomography
Spectral domain optical coherence tomography is an imaging technique used in medical diagnostics, particularly in...
swept source optical coherence tomography
Swept-source optical coherence tomography is an imaging technique used in medical diagnostics, particularly in...
photopic vision
Vision by means of retinal cones; color vision. Relatively high levels of luminance are required for photopic vision.
ocular accommodation
The physical adaption of the eye lens, by means of ciliary muscle contraction, in order to maintain a clear, in focus image...
retina
1. The photosensitive membrane on the inside of the human eye. 2. A scanning mechanism in optical character generation.
pupil
1. In the eye, the opening in the iris that permits light to pass and be focused on the retina. 2. In a lens, the image of...
troland
That level of retinal illuminance resulting when a surface with a luminance of 1 candela/m2 is viewed through a pupil with...
xenon arc photocoagulator
An instrument for eye surgery that directs intense xenon arc light through the transparent cornea lens to the retina where...
ophthalmoscope
Also referred to as a funduscope, an ophthalmoscope is a specialized instrument used by ophthalmologists for observing and...

(46 results found)

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