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At least 613 records · Page 34Linked to original sources
PubMed1975

[Anomaloscopic results in extrem-anomalous trichromats (author's transl)].

The results in 55 extreme deuteran and 34 extreme protan trichromats examined with the anomaloscope are reported, which make together about 9% of all red-green vision disturbances in a group of Federal Army relatives. Not only the deuteran but also the protan group make fewer mistakes with red colours as with green.

Color Perception↗
PubMed1997

The objective measure of color vision in primary open angle glaucoma.

PURPOSE: To objectively evaluate the clinical application of color pattern reversal visual evoked potential (CPR-VEP) on primary open angle glaucoma (POAG). METHODS: CPR-VEP and FM 100-hue test were performed in 31 eyes with POAG and 33 normal eyes. Color pattern stimulation was presented by color monitor controlled by computer program. The reversal rate of the stimulating pattern was 2 Hz and the spatial frequency of the stimulating was 0.53 cycle/degree. The color stimulating pattern include White/Black, Red/Black, Green/Black, Blue/Black, Yellow/Black, Red/Green and Blue/Yellow. RESULTS: CPR-VEP P1 latencies were obviously prolonged in POAG group in comparison with normal control group in equiluminance. All CPR-VEP P1 amplitudes, except Blue/Black P1 amplitude, show no differences between POAG group and normal control group. CONCLUSION: P1 latencies of all CPR-VEP and P1 amplitude of Blue/Black CPR-VEP were parameters for identifying acquired dyschromatopsia caused by POAG. The results showed nonselective damages in color channels and luminance channel in POAG. CPR-VEP is helpful in detecting acquired dyschromatopsia.

Adolescent↗
PubMed2000

[The clinical application of different brightness and different saturation D-15 tests].

PURPOSE: To compare the clinical application of different brightness and different saturation D-15 tests. METHODS: Eighteen normal subjects (30 eyes), 19 cases (38 eyes) of congenital color vision defects and 36 cases (59 eyes) of eye diseases were tested with Panel D-15 test, Hann's double D-15 test, middle and low saturation CAS-PI (Psychological Institute, Chinese Academy of Sciences) D-15 tests. RESULTS: A few of the normal eyes made minor errors in the low saturation D-15 tests. All of the protanopes and deuteranopes could be detected correctly. Protanomalias and deuteranomalias showed normal arrange or some type of abnormal arranges in all of the 5 sets of D-15 tests. In sick eyes, the abnormal rates were the highest in the low saturation D-15 tests and the lowest in Panel D-15 test. CONCLUSION: The five sets of different brightness and different saturation D-15 tests had similar efficiencies of detecting congenital color vision defects. The abnormal rates of CAS-PI(4/5)D-15 tests and the CAS-PI(2/5)D-15 tests were similar to those of Panel D-15 test and Hann's Double D-15 test. Both tests can be used in the clinical setting.

Adolescent↗
PubMed2005

Evaluation of a chromatometer: a new method for blue-yellow or green-red visual comparisons, and anomaly screening techniques.

BACKGROUND: Malbrel's chromatometer is a new apparatus which allows color vision to be monitored. The aim of this study was to assess the accuracy of this new examination method. MATERIAL/METHODS: The color vision of a patient was analyzed using a chromatometer for direct heterochromatic visual comparisons. The patient's task was to adjust, using one eye only, the brightness of a yellow (or red) window to the one of a fixed blue (or green) window. Overall, 158 patients, aged 20 to 28, took part in the experiment. First, parametric means were used to study the response distributions and the luminous effects on the responses. Second, using non-parametric means, we considered that a patient had an anomalous color vision according to the chromatometer if the response was higher than the 95th percentile or lower than 5th percentile. Third, anomalous responses were compared with the Ishihara plates and Farnsworth 28-hue responses. RESULTS: The effect of a luminous stimulus on the response was significant (adjusted to the patient effect). Thus, the chromatometer appears to be a good method to analyze color vision. This apparatus was easy to use and constituted a sensitive and specific test with high negative predictive value. CONCLUSIONS: The chromatometer can be used as a first-line screening test to detect color vision anomalies during ophthalmology consultations. The chromatometer can be useful in identifying early ocular disease, monitoring disease development, or checking possible iatrogenic effects of a specific treatment.

Adult↗
PubMed2007

Can color vision defective subjects who pass the farnsworth lantern test recognize surface color codes?

INTRODUCTION: The International Civil Aviation Organization requires that pilots be able to distinguish the colors used in air navigation and in particular be able to identify the colors of signal lights. Most national aviation authorities use a lantern test to assess the ability of applicants for a pilot's license who have abnormal color vision to recognize the colors of signal lights. However, color-coding is now widely used in aviation systems other than signal lights. Color is used in tarmac markings, maps, manuals, and electronic flight instrument displays. These color codes can use 10 or more colors, many more than the 3 to 5 used for signal lights. This study investigated whether people with defective color vision (DCV) who pass the Farnsworth lantern test can recognize the main colors used for surface color codes. METHODS: There were 99 subjects with DCV who were tested using the Optec 900 version of the Farnsworth lantern test and also named the colors of a set of 10 surface colors that varied in shape (dots and lines) and size (3 sizes; angular diameters 0.27, 1.0, and 2.4 degrees; angular widths 0.14, 0.27, and 0.50 degrees). A control group of 20 subjects with normal color vision also named the surface colors. RESULTS: Of the DCV subjects, 19% passed the Farnsworth lantern test, of whom 74% made no errors with the surface colors. The other 26% made few errors (up to 5 errors in 120 presentations) and those errors were mostly to confuse red, orange, and brown. The subjects with normal color vision made no errors naming the surface colors. CONCLUSION: Those who pass the Farnsworth lantern test can recognize the colors of a 10-color surface color code with few or no errors. This is because the small (2.9-min arc) stimulus of the lantern test presents a more difficult task than the larger surface colors.

Adolescent↗