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Farnsworth D15 Dichotomous Color Test Farnsworth Test for Congenital and Acquired color defects. The Farnsworth D-15 contains a reference disc holding notation 10 B 5 4 and fifteen numbered discs which make up an incomplete color circle. The patient arranges the discs and then evaluation of the patients arrangement separates 'normal' color perception from moderate and strong defects in deutan, protan or tritan axis color discrimination. The D-15 is housed in a plexiglass container. the disks are spread out on a table and arranged by the patient. The Farnsworth D-15 test is a subset of the well known Farnsworth 100 Hue Test. It is intended for classification instead of in-depth study of color vision defects. The D-15 and 100 hue tests are correlated. Growing Importance of Color deficiency Screening. In addition to congenital color deficiency screening there is growing evidence that adult acquired color deficiency, especially in yellow and blue perception, can indicate medical toxicity and other problems. Increasingly complex security and medical systems also require verification of all three types of color receptors. How the D-15 test works: The Farnsworth D15 is called 'dichotomous' because it is designed to separate subjects into one of two groups, 1) Strongly color deficient or 2) Mildly color deficient or color normal. This is accomplished by the arrangement of vivid (saturated) colored discs. A perfect score shows normal color perception. A non-perfect score is used to determine a medium or strong color deficiency. -
Designed by two low vision doctors. This chart has a 20/630 size number as well as numbers & tumbling "E's" that are 20/500, 20/400, & 20/317 sizes. These take the memory out of acuity testing. The 20/250 page & below have four numbers of the same size. This allows you to test each eye individually without concern for memoriztion. Also, by observing which number is seen first, the tester can decide which part of the field has the best fixation. Chart lists size by logmar & Snellen equivalent to 20/20. -
Free space fusion performed in a new, inexpensive way. Black target circles are printed on two 6" x 7" clear acetate cards. A unique, accurate method of developing increased fusional range without the need for costly lenses or filters. -
Has one plus lens with occluder. The reverse has a minus lens and occluder. Available in diopters 0.25 to 4.00 in +/-0.25 increments. These flippers are designed to allow for monocular training of accommodation without the need of a patch. Item #: BC1277+ -
Near and Far Chart Sets provides matrix for testing and accommodative vision training. Item #: BARCSET -
Fixed Demands Tranaglyph™ Kit (60 Series) Ideal for testing or training in true space at the office or home. Eliminates suppression while developing fusion and stereopsis. Non-variable prismatic Red/Green slides build fusional convergence & divergence. 2PD increments from 0 to 30PD BI or BO. 10" x 5.5" Red/Green targets on frosted vinyl. Can be used with Polachrome Trainer. Item #: BC60K+ -
Headline Stereoscope Cards (30 Cards) This set inclucdes 30 cards! You can train basic fusion skills such as luster to simultaneous perception and stereoscopic viewing (3-D). -
Child Vectorgraphic Projector Slide → Training Demonstration → Tumbling E Monocular 20/100 – 20/15 (9 Lines) → Acuity Balance 20/30 – 20/20 (3 Lines) → Tumbling E Binocular 20/30 – 20/15 (4 Lines) → Fixation Disparity with Fusion Lock → Stereopsis 215 - 40 seconds of arc -
Two mirrored sides septum, frontally and non-symmetrically set, is recommended for binocular training; antisuppressive and fusional activities; central-peripheral instrument applied in amblyopia. Easy to teach figure-ground, therapy and brain injury neuro-optometric rehabilitation (neglect). -
Yoked Empty Rotating Prisms (VTE) Plastic frame with nasal anatomical fit for children. Blue and Red Colors Item #: E/FRRYPC -
Designed for use in manual Chart Projectors including products from: R.H. Burton, Marco, Reichart, Topcon, and Woodlyn. Includes test for: → Sloan Letters 20/300 – 20/10 (14 Lines) → Astigmatic Clock → Sloan Numbers 20/50 – 20/10 (6 Lines) → Tumbling E 20/200 – 20/15 (7 Lines) Item #: VA1113 -
The new Random Dot 3D Clock Variable Tranaglyph is an excellent new training device for both the mid-level and final stages of base-in and base-out therapy. Unlike the typical 3D training images, random dot images can not be seen unless the highest level of fusion is achieved. The images simply look like a page full of dots, until the two eyes and brain combine these two sets of unique images into a single three dimensional image. This makes it an excellent therapy technique for those patients who are simply guessing or malingering with traditional cards sets. The level of fusion needed is the most difficult to obtain and requires the highest level of visual processing, which makes it an excellent finalization exercise. For patients who have had limited binocular vision, such as the recently corrected amblyopic or strabismic patient, this task may prove to be too difficult. For those patients, you may need to start with a 500 series tranaglyph, then progress to the 600 series and finalize with the Random dot series. Item #: BC12+
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