The Optonet Vision Unit (OVU) is an advanced web platform, CE marked Class I medical device, registered with theMedicines and Healthcare products Regulatory Agency (MHRA), with reference number: 5943
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Smart Case History
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The vision Unit incorporates an innovative interactive questionnaire to remind key questions when taking the CaseHistory, based on patient’s symptoms and characteristics. The program will also suggest a list of tentative diagnosis
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Visual Acuity
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LogMAR VA chart with Sloan letters, usually known as Original ETDRS (1982).
This is considered the gold standard for VA, for its better accuracy and reliability
Equal number of letters per row (5)
Sloan letters
of similar legibility
Geometric progression
of letter size
Space uniformity
between letters
and rows (0.1 log)
Letter by letter VA scoring system
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Revised ETDRS logMAR chart (1993): combinations of letters were adjusted from a study in7420 eyes, to balance the difficulty per row
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LogMAR VA chart with original British Standard letters (BS 4274-1: 1968) as designed by Bailey & Lovie (1976)
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Bailey & Lovie LogMAR VA chart with latest British Standard letters (BS 4274-1: 2003)
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LogMAR VA chart with round numbers in a 5x4 proportion
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LogMAR VA chart with square shaped numbers in 5x5 grid (similar to Snellen tumbling “Es”)
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LogMAR VA chart with Landolt C rings. It can be displayed in either 5 or 8 different positions (2 options)
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LogMAR VA chart with “Tumbling Es” in a 5x5 grid
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Vanishing Optotypes for VA
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Vanishing Visual Acuity ETDRS charts designed for early detection of Age-related Macular Degeneration (AMD)
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Vanishing Visual Acuity charts with Landolt rings for early detection of AMD
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Children’s Visual Acuity
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Kay pictures are the only fully researched and validated picture optotypes that havebeen shown to provide accurate measurements earlier than letter and symbol charts
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Children’s logMAR VA chart with Landolt Rings (Broken Glasses™ chart)
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Children’s logMAR VA chart with Symmetrical letters.
Any combination of letters can be chosen from the following: X, V, O, H, U, T
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Single rows of 5 symmetrical letters with a crowding effect and in a logMAR progression,
specially designed for plotting children's VA Percentile graphs
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LogMAR ETDRS chart with Symmetrical letters (H, O, T, V) and crowding effect, as described in
The Amblyopia Treatment Study - Visual Acuity Testing Protocol
Each and every VA chart offers a wide variety of options to assist clinical measurement. Some of those will beshown next
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Any row of letters (or symbols) can be highlighted with red lines on both sides
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A row of letters can also be isolated, and its size changed
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It is possible to add contour interaction, and also use a red arrow to point to the letter of interest
(very useful for young children)
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We can keep adding the next row down, with smaller letters
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We can also isolate a column with letters of a decreasing size; useful for a quick estimation of visual acuity
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A single letter can be isolated, with or without contours (for crowding effect)
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The vision Unit also allows changing randomly the distribution of letters (or symbols), to preventthe patient from memorizing the charts
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Automated VA calculation andrepeated meaurements
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Automated VA calculation for easy logarithmic measurement. It is activated by pressing the number of letters seenper row (0 to 5) on the keyboard or remote-control menu. At the endpoint, the VA score is shown in different scales
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Taking several VA measurements is very useful for a more accurate VA measurement, and to determine personalpatient response variability, for future visits. The program calculates the mean VA and standard deviation (SD)
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Intermediate VA steps
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Accuracy and reliability can be improved by adding middle sized rows of letters
(changing size by 0.05 log steps, rather than the standard step of 0.1 log)
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Refraction
The vision Unit offers a wide variety of vision tests for a thorough eye care examination.
Let’s start with refraction charts
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A Duochrome mask is available for all logMAR visual acuity charts
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Duochrome with single line of letters
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Clock Dial test
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Fan & Block test
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Fan & Block test for Cyl axis calculation.
The arrow can be turned in 1-degree steps, until patient sees both sides appearing equally sharp
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Power is then calculated by adding cyl lenses until both sets of lines appear equally sharp
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Near Vision Charts
The vision Unit incorporates various tests and optotypes to assess near vision
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Unrelated sentences in logarithmic progression for near vision (the OVU has to be calibrated for viewingdistance first). The phrase of interest can be pointed with red lines
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Binocular Vision
A wide variety of binocular tests is also available in the vision Unit
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Heterophoria
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Test for Horizontal Heterophoria measurement using a vertical prism. The test is calibrated in prism dioptersfor the viewing distance
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Test for Horizontal Heterophoria measurement using the Maddox rod.
The test is calibrated in prism diopters for the viewing distance
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Test for Vertical Heterophoria measurement using the Maddox rod, calibrated in prism diopters
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Fixation Disparity
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Horizontal Fixation Disparity (FD) test, that may be used to measure horizontal associated phoria (the prismthat compensates FD). Red/blue filters required
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The Fixation Disparity test allows measuring FD in minutes of arc (calibrated for the viewing distance selected).
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Vertical Fixation Disparity test for Associated Phoria calculation and / or measuring FD (in minutes of arc).
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This Vertical Fixation Disparity test can also measure FD (in minutes of arc).
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Foveal Suppression
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Foveal Suppression test: with the red/blue filters, blue letters are only seen by right eye eye whilst red lettersare only seen by left eye (red filter before RE). The central column is seen with both eyes (binocularly)
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Worth Suppression test with red/blue filters. The Unit allows changing the size of the circles, in degrees.
(To vary the size of the retinal area stimulated)
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Stereoacuity
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Contour Stereoacuity test (local stereopsis), to be viewed with red/blue filters
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Random-dot Stereoacuity Test for red/blue filters. It is possible to choose the type of letters or figures to showin 3D, as well as their size
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Aniseikonia
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Aniseikonia with red/blue filters. The size can be changed in 0.25% steps for greater accuracy
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Cyclorotation
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Cyclorotation test for red/blue filters
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Incomitancy
The vision Unit also includes tests to evaluate incomitant deviations
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Horizontal ocular deviation test, calibrated in prism diopters for the chosen viewing distance (viewed withred/blue filters)
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Vertical ocular deviation test calibrated in prism diopters
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Hess Screen test to map incomitant ocular deviations in different gaze directions (with red/blue filters)
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Test results in the Hess screen assessment of ocular motility in 9 diagnostic gaze positions for each eye
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Ocular Health
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Contrast Sensitivity
Several methods are offered for the assessment of contrast sensitivity
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Low contrast visual acuity charts. Any level of contrast can be set, from 0 to 2.25 log, in 0.15 log steps
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Contrast sensitivity charts with letters of fixed size (as proposed by Pelli-Robson).
Any letter size can be selected
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Potential Visual Acuity
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Potential visual acuity Super-Pinhole to be used in patients with cataracts and other ocular media opacities
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Amsler Grids
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White grid over black background
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Amsler grid with diagonals for patient with central scotoma
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Amsler charts – Red grid over Black background
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Amsler charts – black grid over white background
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Red desaturation test, useful in the detection of visual field defects
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Pseudoisochromatic Ishihara Plates: the most commonly used colour vision test
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The Farnsworth D-15 colour vision test offers a quantitative analysis of colour perception anomalies, especiallythose acquired (which are usually tritan: yellow-blue). The Lanthony Desaturated D-15 version is also included,for improved sensitivity.
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Multifixation Campimeter for the screening of visual field defects
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Orthoptics
Binocular Vision Training
The vision Unit offers a complete range of vision procedures for the treatment of Convergence Insufficiency(either with red/blue filters or 3D polarized screen). All test have automated feedback
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Blocks game for Anti-suppression training and binocular coordination
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Anaglyph Fusion Circles for the treatment of horizontal fusional vergences (Convergence & Divergence)
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Automated forced-choice anaglyph with accommodative control for the measurement and treatment ofhorizontal fusional vergences
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Automated forced-choice anaglyph with accommodative control for the measurement and treatment ofvertical fusional vergences
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Anaglyph stereograms for the treatment of horizontal fusional vergences. When fused, the image is perceivedin 3D (to monitor patient’s compliance)
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Random dot stereograms for vertical vergence measurement and treatment (infra and supra - vergences)
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Test for automated forced-choice monocular accommodation facility measurement and training
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Chart for ocular saccadic and pursuing eye movements
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Complete patient management and record keeping for Binocular Vision Training
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Home-based
Orthoptics / Vision Training
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The Home Training feature offers the professional remote control and monitoring of the exercises prescribedfor home