Description
Plastic
Beads
Nylon
String
Beads
wood
Therapeutic
heavier cords
About Farnsworth D-15 color blind test
- The Farnsworth D-15 Color Test is a fast, reliable tool used to screen and classify moderate to severe color vision deficiencies. During the test, the patient arranges 15 colored caps in a smooth hue sequence starting from a fixed reference cap; the resulting order and any crossing errors reveal whether the defect follows a red–green or blue–yellow (tritan) pattern. Because it is quicker than the Farnsworth 100 Hue yet more informative than simple pass/fail plates, it is widely used in routine clinics, occupational evaluations, and follow-up of acquired color vision loss.
- What it measures: Ability to discriminate and order hues, especially for moderate–severe defects
- How it works: Arrange 15 caps in color order from a reference cap; examiner evaluates the error pattern
- What it detects: Differentiates red–green vs blue–yellow color vision deficiencies
- Clinical value: Determines functional significance of a color defect rather than just presence
- Common uses: Clinical diagnosis, occupational screening, and monitoring optic nerve/retinal conditions
- Testing conditions: Requires standardized daylight-equivalent illumination and minimal glare
- Results: Error patterns can be plotted to show type and severity and compared across visits
- Care: Keep caps clean and protected from fading; avoid heat and direct sunlight; store in the case after use
FarnsworthMunsell 100 Hue Test
- The D15 set is a modification of the well-known FarnsworthMunsell 100 Hue Test. The D15 test is intended for classification instead of more time-consuming in-depth study of color vision defects using the 100-Hue test.
- Each D15 set contains a reference disc and fifteen numbered discs, which make up an incomplete color circle. Following an attempt to sequentially arrange the discs by the patient, evaluation determines color perception or defects in deutan, protan or tritan axis discrimination.
| Topic | Details |
| Catagory | Color Vision Test |
| Material | The Farnsworth D-15 Color Vision Test is designed to screen and classify color vision deficiencies, particularly red-green defects (protan and deutan) and blue-yellow defects (tritan). It is widely used by optometrists, ophthalmologists, occupational health clinics, and vision screening programs to detect both congenital and acquired color vision abnormalities. |
| Item Weight | The test consists of colored caps/discs with printed color surfaces based on standardized hue values. The discs are mounted in durable plastic caps and stored in a protective plastic storage case to maintain color stability. |
| Size | The kit contains small, easy-to-handle color caps arranged in a tray or case. Each cap is designed to be easily picked up and rearranged by the patient during testing. |
| Components / Structure | The set includes 16 color caps: 1 fixed reference cap and 15 movable color caps. The patient arranges the movable caps in sequential order of hue starting from the reference cap, forming part of a color circle. |
| How to use for | The test is administered under standardized illumination conditions. The patient is asked to arrange the 15 movable caps in order of similar color hue starting from the reference cap. The arrangement pattern is then evaluated to determine the presence and type of color vision deficiency. |
| Scoring & Classification | Results are interpreted by plotting the cap order on a color confusion diagram. Specific patterns of errors (crossing confusion lines) help classify color vision deficiencies such as protan (red-deficient), deutan (green-deficient), or tritan (blue-yellow) defects. |
| Testing Requirements | Accurate results require standard illumination conditions (e.g., daylight equivalent lighting) because color perception is highly dependent on lighting quality and brightness. |
| Speed / Efficiency | The D-15 test is quick and easy to administer, typically completed within a few minutes. It is faster than detailed tests such as the Farnsworth-Munsell 100 Hue Test, making it suitable for screening purposes. |
| Durability / Portability | The colored caps are durable but should be handled carefully to prevent scratching, fading, or contamination from fingerprints. The compact storage case makes the test set easy to transport and store. |
| Storage | The discs should be stored in their protective case away from direct sunlight, heat, and moisture to preserve color accuracy and prevent fading over time. |
| Limitations | The Farnsworth D-15 test may not detect very mild color vision defects, since the hues are relatively saturated. It is primarily intended for screening and classification rather than detailed color discrimination analysis. |
| Unique Selling Proposition (USP) | The test is simple, fast, portable, and widely accepted worldwide for color vision screening. It can classify the type of color vision defect without requiring literacy, making it suitable for a wide range of patients and occupational screening environments. |
Reviews
There are no reviews yet.