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Clarity of vision
Visual acuity (VA) commonly refers to the clarity of vision, but technically rates an animal's ability to recognize small details with precision. Visual
Visual_acuity
Clarity of near objects or letters
Near visual acuity or near vision is a measure of how clearly a person can see nearby small objects or letters. Visual acuity in general usually refers
Near_visual_acuity
Decreased ability to see
No or mild visual impairment – presenting visual acuity better than 6/18 Category 1: Moderate visual impairment – presenting visual acuity worse than
Visual_impairment
Eye chart
A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who
Snellen_chart
Series of tests assessing vision and pertaining to the eyes
followed by 8 steps of visual acuity, pupil function, extraocular muscle motility and alignment, intraocular pressure, confrontational visual fields, external
Eye_examination
Eye chart
ophthalmologists, orthoptists, optometrists, and vision scientists to estimate visual acuity. The name of the chart is an abbreviation for "logarithm of the Minimum
LogMAR_chart
Type of visual acuity and hyperacuity
Vernier acuity (from the term "vernier scale", named after astronomer Pierre Vernier) is a type of visual acuity – more precisely of hyperacuity – that
Vernier_acuity
Failure of the brain to process input from one eye
in spatial vision, including reductions in visual acuity, contrast sensitivity function, and vernier acuity, as well as spatial distortion, abnormal spatial
Amblyopia
Chart used to measure vision
An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on
Eye_chart
Development of visual ability in human infants
include visual acuity, tracking, color perception, depth perception, and object recognition. Unlike many other sensory systems, the human visual system – components
Infant_visual_development
Loss of vision without any organic cause
Functional visual loss (FVL) also known as Functional vision loss or Nonorganic visual loss (NOVL) is a reduction in visual acuity or loss of visual field
Functional_visual_loss
Eye chart designed for children
of visual acuity. As is desirable of a good vision test, each of the four optotypes used in the symbols test has been proven to measure visual acuity similarly
Lea_test
Visual impairment
abuse). Normal ophthalmology tests (best-corrected visual acuity, dilated fundus examination, visual field, and electroretinogram); not caused by previous
Visual_snow_syndrome
Visible difference in brightness or color
"contrast sensitivity acuity equivalents", with lower acuity values falling in the area under the curve. In patients with normal visual acuity and concomitant
Contrast_(vision)
Topics referred to by the same term
up acuity in Wiktionary, the free dictionary. Acuity may refer to: Visual acuity, the behavioral ability to resolve fine image detail Tactile acuity, resolving
Acuity
Standardized table for testing visual acuity
romanized: Tablitsa Golovina-Sivtseva) is a standardized table for testing visual acuity, which was developed in 1923 by Soviet ophthalmologists Sergei Golovin
Golovin–Sivtsev_table
Experience of hallucinations by blind people
correlated with CBS are a decrease of visual acuity, visual field loss, and elderly age. While characteristic features of visual hallucinations are not specifically
Visual_release_hallucinations
Small pit in the retina of the eye responsible for all central vision
ganglion cell layer contains two to four layers of cells, and is where visual acuity is below the optimum. The perifovea contains an even more diminished
Fovea_centralis
Set of optotypes used to test visual acuity
ophthalmologist Louise Sloan in 1959, are a set of optotypes used to test visual acuity generally used in Snellen charts, logMAR charts and ETDRS charts. These
Sloan_letters
Eyesight capabilities of horses
are less light-sensitive, but allow the eye to see color and provide visual acuity, and rod cells, which are more light-sensitive, providing night vision
Equine_vision
Angle an object subtends at the eye
the perceived visual angles. This finding has implications for spatial illusions such as the visual angle illusion. Visual acuity Visual angle illusion
Visual_angle
Senses for birds
leverage for safe flight. Birds have a number of adaptations which give visual acuity superior to that of other vertebrate groups; a pigeon has been described
Bird_vision
German scientist (born 1950)
clinical electroretinography, visual acuity testing, and visual perception. Bach is the creator of website Optical Illusions & Visual Phenomena, which began
Michael Bach (vision scientist)
Michael_Bach_(vision_scientist)
Supernormal aspect of visual perception
of our senses is defined by the finest detail we can discriminate. Visual acuity is measured by the smallest letters that can be distinguished on a chart
Hyperacuity
Overview of the vision and optics of humans and other organisms
suppression of the hormone melatonin and entrainment of the body clock. Visual acuity is acuteness or clearness of vision, especially form vision, which is
Optics_and_vision
Type of neuroepithelial cell
only cone cells; and is the region capable of producing the highest visual acuity or highest resolution. Across the rest of the retina, rods and cones
Photoreceptor_cell
Ophthalmological testing tool
it, used by ophthalmologists, orthoptists and optometrists to test visual acuity. The occluder is a simple way to focus light, as in a pinhole camera
Pinhole_occluder
Area of one's field of vision outside of the point of fixation
based on several features of visual performance. Visual acuity declines systematically up to 30° eccentricity: At 2°, acuity is half the foveal value, at
Peripheral_vision
from a grey block, is then the measurement of visual acuity of the eye. For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD
Eye
Dutch ophthalmologist (1834–1908)
Dutch ophthalmologist who in 1862 introduced the Snellen chart to study visual acuity. He took over directorship of the Netherlands Hospital for Eye Patients
Herman_Snellen
Eye that appears red due to illness or injury
assessment can be performed using a careful history, testing vision (visual acuity), and carrying out a penlight examination. Particular signs and symptoms
Red_eye_(medicine)
Gradual retinal degeneration leading to progressive sight loss
photoreceptor cells, which are responsible for color vision, visual acuity, and sight in the central visual field. The progression of disease occurs in both eyes
Retinitis_pigmentosa
Eye disease characterized by leakage of fluid under the retina
A blurred or gray spot in the central visual field is common when the retina is detached. Reduced visual acuity may persist after the fluid has disappeared
Central serous chorioretinopathy
Central_serous_chorioretinopathy
Removal of opacified lens from the eye
lights, especially at night, blunting of colors in vision and reduced visual acuity at low light levels. During cataract surgery, the cloudy natural lens
Cataract_surgery
Paraphyletic group of birds
and rely heavily on it for a number of tasks. They utilize their high visual acuity to obtain food, navigate their surroundings, distinguish and flee from
Bird_of_prey
Measure of vision
Stereoscopic acuity, also stereoacuity, is the smallest detectable depth difference that can be seen in binocular vision. Stereoacuity is most simply explained
Stereoscopic_acuity
Medical procedure for the eye
survival (visual acuity better than 1.30 logMAR or 20/400 Snellen): 63% for OOKP and 49% for OKP 10-year functional survival (visual acuity better than
Osteo-odonto-keratoprosthesis
Medical condition
a visual acuity of 20/40 or better, while 33% of patients over 60 years old had a visual acuity of 20/200 or worse. The most severe visual acuity impairment
Choroideremia
Diagnostic tool
The Jaeger chart is an eye chart used in testing near visual acuity. It is a card on which paragraphs of text are printed, with the text sizes increasing
Jaeger_chart
Television placement for immersive experience
This is its ability to distinguish between two pixels. For normal visual acuity (6/6 vision), this angle is 1 arcmin. To obtain a fixed distance for
Optimum_HDTV_viewing_distance
Medical condition
symptom. The conditions include: monochromatic color blindness, poor visual acuity, and day-blindness. The syndrome is also present in an incomplete form
Achromatopsia
Medical condition
characterised by developmental delay, intellectual disability and decreased visual acuity. All patients described have suffered from developmental delay, intellectual
Bosch–Boonstra–Schaaf optic atrophy syndrome
Bosch–Boonstra–Schaaf_optic_atrophy_syndrome
Topics referred to by the same term
sharpness, the area of maximal optical resolution Sharpness of vision, or visual acuity A bitterness of flavour, for example, in sharp cheddar cheese Intelligence
Sharpness
Ophthalmological chart
as a tumbling E chart, is an eye chart used to measure a patient's visual acuity. This chart does not depend on a patient's easy familiarity with a particular
E_chart
Bird of prey
mainly woodland birds with short broad wings, long tails, and high visual acuity. They hunt by dashing suddenly from a concealed perch. In the United
Hawk
Eye testing method
determine the combination of lenses that will provide the best corrected visual acuity (BCVA). It is a clinical examination used by orthoptists, optometrists
Subjective_refraction
Irish Paralympic athlete
which is an inherited retinal disease. Its main symptom is loss of visual acuity, uncorrectable with glasses. Comerford won a bronze medal in the 100
Orla_Comerford
Clade of primates endemic to the island of Madagascar
cathemeral, or diurnal), lemurs exhibit low visual acuity and high retinal summation. Lemurs can see a wider visual field, however, than anthropoid primates
Lemur
German physiologist (1834–1918)
certain visual tasks that exceeds visual acuity by about an order of magnitude. In his famous 1899 treatise "On the Limits of Visual Acuity" he summarized
Ewald_Hering
Deformation of the eye's cornea into a conelike shape
vision deteriorates, sometimes rapidly due to irregular astigmatism. Visual acuity becomes impaired at all distances, and night vision is often poor. Some
Keratoconus
Extinct Devonian genus of Eurypterida
eyes of Jaekelopterus indicate it was active and powerful with high visual acuity, most likely an apex predator in the ecosystems of Early Devonian Euramerica
Jaekelopterus
Region of the brain that processes visual information
representation and processing capacity devoted to the central visual field, essential for detailed visual acuity and high-resolution processing. Notably, neurons in
Visual_cortex
Field of medicine treating eye disorders
performed during a complete eye examination that enable diagnosis: Visual acuity assessment Ocular tonometry to determine intraocular pressure Extraocular
Ophthalmology
Mitochondrially inherited degeneration of retinal nerve cells
after the onset of visual loss. A pupillary defect may be visible in the acute stage as well. Examination reveals decreased visual acuity, loss of color vision
Leber's hereditary optic neuropathy
Leber's_hereditary_optic_neuropathy
Diabetes-induced damage to the retina of the eye
The ICO recommends eye examinations for those with diabetes include a visual acuity examination and a retinal examination via ophthalmoscopy or retinal
Diabetic_retinopathy
Corrective ophthalmological surgery
an excimer laser to reshape the corneal stroma in order to improve visual acuity. LASIK is very similar to another surgical corrective procedure, photorefractive
LASIK
Condition characterized by absence of pigment
fibres Photophobia and decreased visual acuity due to light scattering within the eye (ocular straylight) Reduced visual acuity due to foveal hypoplasia and
Albinism_in_humans
State of vision
requires no corrective lenses for distance; the vision scores well on a visual acuity test (such as an eye chart test). While emmetropia implies an absence
Emmetropia
Birds of prey in the genus Falco
many birds of prey, falcons have exceptional powers of vision; the visual acuity of one species has been measured at 2.6 times that of human eyes. They
Falcon
Theory of cognitive development in early humans
on mankind. McKenna claimed that minor doses of psilocybin improve visual acuity, including edge detection, which bettered the hunting skills of early
Stoned_ape_theory
Body parts responsible for vision
testing to assess visual acuity of a newborn, detect nearsightedness and astigmatism, and evaluate the eye teaming and alignment. Visual acuity improves from
Visual_system
Medical condition
The attack can be misdiagnosed and treated as an acute iridocyclitis. Visual acuity transiently deteriorates during the attack.[citation needed] Older patients
Keratoendotheliitis fugax hereditaria
Keratoendotheliitis_fugax_hereditaria
The MNREAD acuity chart or Minnesota low vision reading chart is a text based chart used to measure near visual acuity in people with normal or low vision
MNREAD_acuity_chart
Medical diagnostic method
Monoyer chart was created by Ferdinand Monoyer and is used to test visual acuity. He inserted his name in the chart; reading upwards on both ends, but
Monoyer_chart
Medical condition
is an inherited eye disease that causes severe color blindness, poor visual acuity, nystagmus, hemeralopia, and photophobia due to the absence of functional
Blue-cone_monochromacy
Impairment in recognition of visually presented objects
Visual agnosia is an impairment in recognition of visually presented objects. It is not due to a deficit in vision (acuity, visual field, and scanning)
Visual_agnosia
Blindness sports classification
(IBSA) defines this classification as "visual acuity ranging from LogMAR 1.50 to 2.60 (inclusive) and/or visual field constricted to a diameter of less
B2_(classification)
Order of mammals
size) compared to other mammals, as well as an increased reliance on visual acuity at the expense of the sense of smell, which is the dominant sensory
Primate
Visual maladies
retina, but if light is shown to seeing half, pupil shows reaction. Visual acuity is intact. Optic disc changes: descending type of parital optic atrophy
Visual_pathway_lesions
Genetic form of macular degeneration
presentation and late-onset is possible. The main symptom is loss of visual acuity, uncorrectable with glasses. This manifests as the lack of the ability
Stargardt_disease
Blindness present at birth
Odom JV, McCulloch DL, Thompson DA (February 2021). "VEP estimation of visual acuity: a systematic review". Documenta Ophthalmologica. Advances in Ophthalmology
Congenital_blindness
Ability to interpret the surrounding environment using light in the visible spectrum
frequency Visual acuity Visual illusion Visual processing Visual system Sensations Achromatopsia Akinetopsia Apperceptive agnosia Associative visual agnosia
Visual_perception
Medical condition of the eye
Damage to the cornea due to corneal perforation can cause decreased visual acuity. Corneal perforation may cause difficulty in seeing and persistent eye
Corneal_perforation
Electrical potential evoked in the nervous system
development of visual acuity and contrast sensitivity through the first years of life. They have emphasized that, in diagnosing abnormal visual development
Evoked_potential
Surgery to remove vitreous humor from the eye
epiretinal membrane and is also complaining of symptoms such as decreased visual acuity, then a membranectomy is performed in addition to the vitrectomy. Complications
Vitrectomy
Rare symptom of brain damage where those affected deny being blind
often fall, and would reach for things and often miss his target. His visual acuity is less than 20/200, being unable to read the large letters on a standard
Anton_syndrome
Inflammatory disorder
redness, hypopyon, and decreased visual acuity, while posterior uveitis presents with painless decreased visual acuity and visual field floaters. A rare form
Behçet's_disease
Medical condition
and lead to decreased visual acuity, proptosis, pupillary defects, optic atrophy, congestion of bulbar conjunctiva, and visual field defects. Retinal
Bonnet–Dechaume–Blanc syndrome
Bonnet–Dechaume–Blanc_syndrome
United States military acronym
all military duty. E-1. Uncorrected visual acuity 20/200 correctable to 20/20 in each eye. E-2. Distant visual acuity correctable to not worse than 20/40
PULHES_Factor
Blindness sports classification
sport. Competitors in this classification have partial sight, with visual acuity from 2/60 to 6/60. It is used by a number of blind sports including
B3_(classification)
French Paralympic judoka
was seventeen following a motorcycle accident; he was left with 5% visual acuity. "Sebastien Le Meaux". International Paralympic Committee. Archived
Sébastien_Le_Meaux
Medical condition of the eye
Wagner's disease is a familial disease of the eye that can cause reduced visual acuity. Wagner's disease was originally described in 1938. This disorder was
Wagner's_disease
Vision loss due to damage to the macula of the eye
of vision Slow recovery of visual function after exposure to bright light (photostress test)[citation needed] Visual acuity drastically decreasing. (two
Macular_degeneration
Sensory organ of vision
small area of the retina with very high visual acuity, the fovea centralis. It covers about 2 degrees of visual angle in people. To get a clear view of
Human_eye
Medical condition
genetic disorder characterized by early-onset nyctalopia, decreased visual acuity, and abnormal findings of the fundus. It is a type of progressive vitreotapetoretinal
Goldmann–Favre_syndrome
Type of dog
visual acuity than their antecedent, the wolf. There is no science-based evidence to confirm the popular belief that sighthounds have a higher visual
Sighthound
Sight restoration technique
read much smaller fonts – down to equivalent acuity of 20/63, with the average improvement of visual acuity by 5 lines on ETDRS chart, compared to baseline
Photovoltaic retinal prosthesis
Photovoltaic_retinal_prosthesis
Worsening ability of the eyes to focus with age
Results are, however, more variable and some people have a decrease in visual acuity. Concerns with refractive surgeries for presbyopia include people's
Presbyopia
Medical condition
autosomally inherited disease that affects the optic nerves, causing reduced visual acuity and blindness beginning in childhood. However, the disease can seem
Kjer's_optic_neuropathy
(fine) lines and the pattern without lines, he could measure the babies' visual acuity. In 1978, Held found that impediments to vision in babies, such as drooping
Richard_Held
Visual perception under low-light conditions
combination of scotopic and photopic vision. This gives inaccurate visual acuity and color discrimination. In normal light (luminance level 10 to 108
Scotopic_vision
Natural number
In some countries, the number 20 is used as an index in measuring visual acuity. 20/20 indicates normal vision at 20 feet (6.1 m), although it is commonly
20_(number)
Clouding of the lens inside the eye, causing poor vision
or optometrist and consist of testing vision at various distances (visual acuity test), slitlamp microscopy, and retinal examination. A slit-lamp examination
Cataract
Large bird of prey
is estimated that the wedge-tailed eagle has a visual acuity twice that of a typical human. This acuity enables eagles to spot potential prey from a very
Eagle
Para-cycling classification
classification as: "Blind or Visual Impaired (VI), TCB - from no light perception in either eye up to visual acuity of 6/60 and/or visual field of less than 20
Tandem_(UCI)
Pathological condition of the eye
and constrict together. This allows improved balance of uncorrected visual acuity. A 1-mm limbal incisions would be made, a spatula is inserted through
Polycoria
Neuroimaging technique
the neural pathway between the retina and the visual cortex. The objective is to improve the visual acuity of an amblyopic (lazy) eye. Kasteleijn-Nolst
Intermittent photic stimulation
Intermittent_photic_stimulation
Senses of Felis catus
humans need, they appear to reduce net visual acuity, thus detracting when light is abundant. A cat's visual acuity is anywhere from 20/100 to 20/200, which
Cat_senses
Part of an eye
the bottlenose dolphin, it has the function of allowing equivalent visual acuity both in air and in water. The operculum of skates (such as the clearnose
Pupil
Eye protection of the Inuit
only to reduce the amount of light entering but also to improve the visual acuity. Wider slits result in a larger field of view. Like other terms in Inuit
Snow_goggles
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