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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
Eye chart
other charts (e.g., the Snellen chart). For this reason, the LogMAR chart is recommended, particularly in a research setting. When using a LogMAR chart, visual
LogMAR_chart
Chart used to measure vision
visual acuity. The Snellen chart is the most widely used. Alternative types of eye charts include the logMAR chart, Landolt C, E chart, Lea test, Golovin–Sivtsev
Eye_chart
Clarity of near objects or letters
clarity of distance vision, and is measured using eye charts like Snellen chart, LogMAR chart etc. Near vision is usually measured and recorded using
Near_visual_acuity
Dutch ophthalmologist (1834–1908)
January 18, 1908) was a Dutch ophthalmologist who in 1862 introduced the Snellen chart to study visual acuity. He took over directorship of the Netherlands
Herman_Snellen
Series of tests assessing vision and pertaining to the eyes
This is often measured with a Snellen chart or LogMAR chart. Visual acuity is usually measured with a Snellen or LogMAR chart with a lit background to give
Eye_examination
Eye testing method
perpendicular to one another. This is used to search for astigmatism. Snellen chart Duochrome test: used to check the spherical component of the refraction
Subjective_refraction
Surname list
Samuel Constantinus Snellen van Vollenhoven (1816–1880), Dutch entomologist Snellen chart, an eye chart developed by Herman Snellen Snellen at the Database
Snellen
Clarity of vision
was defined by Herman Snellen as the ability to recognize an optotype when it subtended 5 minutes of arc, that is Snellen's chart 6/6-metre, 20/20 feet
Visual_acuity
Diagnostic tool
[citation needed] More commonly, distance vision acuity is tested using the Snellen chart, familiarly seen wall mounted with a large letter at the top.[citation
Jaeger_chart
associated territories. The Snellen chart is an eye chart used by eye care professionals and others to measure visual acuity. Snellen charts are named after Dutch
List of Dutch inventions and innovations
List_of_Dutch_inventions_and_innovations
Blindness present at birth
Screening test: Snellen Chart
Congenital_blindness
Farthest distance an eye can see
accommodation change from 6 m to infinity is negligible. See visual acuity or Snellen chart for details about 6/6 (m) or 20/20 (ft) vision. For an unaccommodated
Far_point
Ineffective alternative eyesight improvement therapy
correctly focus in the distance. He recommended that schools post a Snellen chart in each classroom and encourage students to read it daily. In 1917,
Bates_method
Eye chart designed for children
expressions and often can't read the blackboard or projector. Eye chart Sloan letters Snellen chart Pediatric ophthalmology Infant vision Visual acuity testing
Lea_test
Medical diagnostic method
stick Distance target. For example, most commonly a Snellen chart is utilised, however the LogMAR chart is preferred as it has letters of equal legibility
Prism_cover_test
Failure of the brain to process input from one eye
as an interocular difference of two lines or more in acuity (e.g. on Snellen chart) when the eye optics are maximally corrected. In young children, visual
Amblyopia
Set of optotypes used to test visual acuity
acuity generally used in Snellen charts, logMAR charts and ETDRS charts. These letters, unlike the ones used in older Snellen charts, are designed to give
Sloan_letters
Field of medicine treating eye disorders
where she ran a private eye clinic. Herman Snellen (1834–1908) (Netherlands) introduced the Snellen chart to study visual acuity. Vladimir Petrovich Filatov
Ophthalmology
Medical diagnostic method
ignoring the first line, the name "Ferdinand Monoyer" can be seen. Snellen chart Koki, G.; et al. (October 2013). "Complications oculaires, à l'exclusion
Monoyer_chart
Sensory organ of vision
treatment and management of ocular and vision disorders. A Snellen chart is one type of eye chart used to measure visual acuity. At the conclusion of a complete
Human_eye
Aberration of vision due to asymmetry in the eye's lens or cornea
presence of astigmatism and to quantify its amount and axis. A Snellen chart or other eye charts may initially reveal reduced visual acuity. A keratometer
Astigmatism
State of vision
that 20/20 vision is achieved without correction. For example, on a Snellen chart test, emmetropic eyes score at least "6/6"(m) or "20/20"(ft) vision
Emmetropia
logMAR (Snellen equivalent 20/6). Charts are available in many languages. It allows near visual acuity recording in logMAR notation, Snellen notation
MNREAD_acuity_chart
Optotype
the gap width is the same. This is identical to the letter C from a Snellen chart. The Landolt C is the standard optotype for acuity measurement in most
Landolt_C
Town in Utrecht, Netherlands
worked as a foreign adviser in Japan Hermann Snellen (1834–1908) ophthalmologist, invented the Snellen chart Anthon van Rappard (1858–1892) painter and
Zeist
Type of neurological examination
asked to read progressively smaller lines on the near card or Snellen chart. The Snellen Chart demonstrates visual acuity by presenting standard Roman letters
Cranial_nerve_examination
Visible difference in brightness or color
ophthalmologist assesses a patient's visual acuity using a Snellen chart or some other acuity chart, the target image is displayed at high contrast, e.g.,
Contrast_(vision)
Optical aberration
and to quantify the amount and axis of the astigmatism. A Snellen chart or other eye chart may initially reveal reduced visual acuity. A keratometer may
Astigmatism_(optical_systems)
Vision loss due to damage to the macula of the eye
straight lines appear wavy and some patches appear blank When viewing a Snellen chart, at least 2 lines decline[citation needed] In dry macular degeneration
Macular_degeneration
Scheele Schick test – Béla Schick Shrapnel shell – Henry Shrapnel Snellen chart – Herman Snellen Sousaphone – John Philip Sousa Southern blot – Edwin Southern
List of inventions named after people
List_of_inventions_named_after_people
Decreased ability to see
20/400 in US notation) Snellen (most people below 3/60 are severely sight impaired). Those better than 3/60 but below 6/60 Snellen (people who have a very
Visual_impairment
Austrian ophthalmologist
improvements to eye chart test types that were earlier developed by Heinrich Küchler (1811-1873). In 1862 Dutch ophthalmologist Hermann Snellen introduced the
Eduard_Jäger_von_Jaxtthal
Indian reality show (2023)
announce the four patients he has chosen to treat, then have them read a Snellen Chart. In the second round, Jiya will act as an Oral Dentist and will choose
Bigg Boss OTT (Hindi season 2)
Bigg_Boss_OTT_(Hindi_season_2)
Pasteur discovers the germ theory of disease. 1861 – Snellen chart developed by Herman Snellen. 1867 – Lister publishes Antiseptic Principle of the Practice
Timeline of medicine and medical technology
Timeline_of_medicine_and_medical_technology
Examination to determine eye misalignment
those seen on a Lang stick can be used. Whereas for adults a small Snellen chart letter or number can be used. Distance Targets (6m) Spotlight – In those
Cover_test
Analyzing film in terms of cinematography, sound and editing
formats Optical resolution SMPTE color bars SMPTE Universal Leader Snellen chart Test card Test film Aumont Jacques; Michele Marie (1988). L’Analyse
Film_analysis
Type of visual acuity and hyperacuity
electrophysiological techniques. Vernier scale Stereoscopic acuity Snellen chart Westheimer, Gerald (1975). "Visual acuity and hyperacuity". Investigative
Vernier_acuity
Degeneration of the macula
is affected. Atrophy leads to the loss of two or more lines of the Snellen chart.[citation needed] Fuchs spots are caused by regression of choroidal
Fuchs_spot
Assessment to determine if the nervous system is impaired
their individual purposes (e.g. the visual acuity can be tested by a Snellen chart). "CNII-XII grossly intact" Motor system Muscle strength, often graded
Neurological_examination
Process of classifying disabled cycling participants
classification required that classifiers have access to medical equipment like Snellen charts, reflex hammers, and goniometers to properly classify competitors. At
Para-cycling_classification
Deformation of the eye's cornea into a conelike shape
presence of any family history of ocular disease. An eye chart, such as a standard Snellen chart of progressively smaller letters, is then used to determine
Keratoconus
Medical condition
typically have mildly decreased visual acuity of 20/40 or better on the Snellen chart with a normal slit lamp examination, though there may be a mild vitritis
Acute zonal occult outer retinopathy
Acute_zonal_occult_outer_retinopathy
Ophthalmological chart
visual acuity is quantified. It works on the same principle as Snellen's distant vision chart. Visual acuity Landolt C Basak, Samar K. Ophthalmology Oral
E_chart
Medical condition
loss to be about 0.09 logMAR per 5 years, which is roughly 1 row on a Snellen chart. A diagnosis of choroideremia can be made based on family history, symptoms
Choroideremia
Medical diagnostic method
distance vision charts like a Snellen chart. Testing is done monocularly. Patient is asked to sit in front of an illuminated vision chart, at 6 meter distance
Photostress_test
designed to enable a more accurate estimate of acuity than other charts (e.g., the Snellen chart) and is recommended particularly in a research setting. 1977
Timeline of Australian inventions
Timeline_of_Australian_inventions
Television placement for immersive experience
based on the work of Dr. Hermann Snellen. Dr. Snellen developed the eye examination chart that bears his name (Snellen chart). From his findings and the work
Optimum_HDTV_viewing_distance
Medical condition
proper eye alignment and visual acuity. Visual acuity is assessed with a Snellen chart with lines of letters that the child reads and helps determine visual
Childhood_blindness
= 250 f . {\displaystyle {M}={\frac {250}{f}}.} Optometry Far point Snellen chart Visual perception Visual impairment Katz, Milton (August 1996). "Convergence
Least distance of distinct vision
Least_distance_of_distinct_vision
(Smurf language), Smurf attack, Smurfing. Hermann Snellen, Dutch ophthmalmologist – Snellen chart Willebrord Snellius, Dutch astronomer and mathematician
List_of_eponyms_(L–Z)
Blindness sports classification
with an acuity of 6/24 would be able to read the three top lines on a Snellen chart at six metres." Sports portal Michael Horvat; Leonard H. Kalakian; Ron
B4_(classification)
Loss of visual acuity associated with illness or aging
Acute visual loss Other names Acute vision loss A Snellen chart, which is frequently used for visual acuity testing
Acute_visual_loss
fixation target such as a letter on a fixation stick for near, or a Snellen Chart letter for distance. The patient should wear their refractive correction
Prism_fusion_range
Medical condition
initial assessment does not involve tonometry or eversion of eyelids. A Snellen chart or near card may be used to test visual acuity. If visual impairment
Globe_rupture
tested with stationary, high-contrast standard visual acuity charts such as the Snellen chart with a dimly lit background. However, the acuity may vary from
Bradyopsia
Photographic film for testing equipment quality
Leader Digital Picture Exchange 1951 USAF resolution test chart Optical resolution Snellen chart List of monochrome and RGB palettes Indexed color Color
Test_film
dissecting forceps Thermocautery A standard illuminated E chart A standard illuminated Snellen's chart for distant vision A set of lenses used in refraction
List of instruments used in ophthalmology
List_of_instruments_used_in_ophthalmology
Damage to the optic nerve's front part due to lack of blood flow
visual acuity improves by three or more lines of vision on the Snellen Chart (the chart with smaller letters on each lower line) in 42.7% of patients,
Anterior ischemic optic neuropathy
Anterior_ischemic_optic_neuropathy
Medical classification system for disability judo
classification required that classifiers have access to medical equipment like Snellen charts, reflex hammers, and goniometers to properly classify competitors. The
Disability classification in judo
Disability_classification_in_judo
Nature Reserve in Greater Manchester, England
Tottington Railway Station with the words ‘Barnard Castle’ in the style of a Snellen chart. Rodney created it with the intention to mock Dominic Cummings after
Kirklees Valley Local Nature Reserve
Kirklees_Valley_Local_Nature_Reserve
syndrome named after him in his doctoral dissertation. Hermann Snellen publishes the Snellen chart for testing visual acuity. November 20 – Richard Owen first
1862_in_science
Vision scientist (1898-1982)
determination of the error of refraction." Compared to the previous Snellen Chart letters, Sloan letters do not have serifs, although they do follow the
Louise_L._Sloan
Disability sport classification system
classification required that classifiers have access to medical equipment like Snellen charts, reflex hammers, and goniometers to properly classify competitors. For
Sitting volleyball classification
Sitting_volleyball_classification
Assessment of video quality as experienced by humans
are screened for normal vision or corrected-to-normal vision using Snellen charts. Color blindness is often tested with Ishihara plates. There is an ongoing
Subjective_video_quality
Season of television series
samples to receive their next clue. In Ransdorp, teams had to look at a Snellen chart from a distance and then pole vault across an irrigation ditch, a regional
HaMerotz_LaMillion_8
Australian optometrist
acuity chart, which is now used worldwide, particularly in research settings. The chart was described in 2009 as the most popular redesign of the Snellen chart
Jan_E._Lovie-Kitchin
field of less than 10° B3 LogMAR of 1 − 1.40 (20/200 − 20/500 on the Snellen chart) and/or visual field of less than 40° Upper limb(s) AU2 One upper limb
IFSC Paraclimbing World Championships
IFSC_Paraclimbing_World_Championships
Disability football classification
classification required that classifiers have access to medical equipment like Snellen charts, reflex hammers, and goniometers to properly classify competitors. For
Football 7-a-side classification
Football_7-a-side_classification
Eye disorder
acuity can be tested by Tumbling E, Landolt's broken ring, Snellen's chart, and LogMAR chart tests. Early detection is crucial in treatment of congenital
Childhood_cataract
Quality of an image being out of focus
refractive errors play in limiting the quality of the patient's vision. A Snellen acuity of 6/6 or 20/20, or as decimal value 1.0, is considered to be sharp
Defocus_aberration
Terrestrial planet orbiting the star Proxima Centauri
al. 2023, p. 13. Ribas et al. 2016, p. 3. Coleman et al. 2017, p. 1007. Snellen et al. 2017, p. 2. Walterová & Běhounková 2020, p. 18. Turbet et al. 2016
Proxima_Centauri_b
Angle an object subtends at the eye
University at Buffalo's Interactive Visual Acuity Chart for the display of letters or symbols for a specified Snellen line on your computer monitor at exactly
Visual_angle
Autonomous region of Papua New Guinea
Hamilton, Andrew J. (2010). "Cocoa Pod Borer (Conopomorpha cramerella Snellen) in Papua New Guinea: Biosecurity Models for New Ireland and the Autonomous
Autonomous Region of Bougainville
Autonomous_Region_of_Bougainville
Planet outside of the Solar System
25R. doi:10.1088/2041-8205/753/1/L25. S2CID 119177983. L25. Brogi, M.; Snellen, I. A. G.; De Kok, R. J.; Albrecht, S.; Birkby, J.; De Mooij, E. J. W.
Exoplanet
Eye disease
or peel the membrane through the sclera, improving vision by 2 or more Snellen lines. Usually, the vitreous is replaced at the same time with clear (BSS)
Epiretinal_membrane
Measure of vision
alternating occlusion. A good procedure is a chart, analogous to the familiar Snellen visual acuity chart, in which one letter in each row differs in depth
Stereoscopic_acuity
List of largest planets by size
Bibcode:2025AJ....170..127D. doi:10.3847/1538-3881/adea50. González Picos, D.; Snellen, I. A. G.; de Regt, S.; Landman, R.; Zhang, Y.; Gandhi, S.; Sánchez-López
List_of_largest_exoplanets
Gas layer surrounding Venus
life in atmosphere of Venus". The Guardian. Retrieved 16 September 2020. Snellen, I. A. G.; Guzman-Ramirez, L.; Hogerheijde, M. R.; Hygate, A. P. S.; van
Atmosphere_of_Venus
Research institute
Explanations and sailing directions to accompany the Wind and current charts. Washington D.C.: United States Naval Observatory. pp. 376–377. KNMI Research
Royal Netherlands Meteorological Institute
Royal_Netherlands_Meteorological_Institute
Radio and podcast show episodes
copyright traps, knox boxes, and a design comparison of the Snellen and LogMAR eyesight charts. 243 "Tom Swift and His Electric Rifle" January 17, 2017 22:08
List of 99% Invisible episodes
List_of_99%_Invisible_episodes
Zeeuws Archief Buunk, Frank; van der Schaaf, Nicole; Simonis, Mariëtte; Snellen, Emilie (1994). Romantiek rond de familie Koekkoek. Ede, the Netherlands:
Koekkoek_family
Bibcode:2015A&A...576A.134M. doi:10.1051/0004-6361/201425298. S2CID 119224213. Snellen, I.A.G.; De Mooij, E.J.W. & Albrecht, S. (2009). "The changing phases of
Methods of detecting exoplanets
Methods_of_detecting_exoplanets
Land & irrigation
interweaving of irrigation and drainage for salinity control. In: W.B. Snellen (ed.), Towards integration of irrigation, and drainage management. ILRI
Environmental impact of irrigation
Environmental_impact_of_irrigation
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