China
Africa
Explore chapters and articles related to this topic
Clinical Examination in Neuro-Ophthalmology
Published in Vivek Lal, A Clinical Approach to Neuro-Ophthalmic Disorders, 2023
Selvakumar Ambika, Krishnakumar Padmalakshmi
Testing of color perception is done one eye at a time. Ishihara pseudo-isochromatic chart is commonly used to assess color vision in day-to-day practice. The test plate in the Ishihara chart is to determine whether or not the vision good because it cannot be read in patient with severe visual impairment. It is a simple screening tool as it can be performed rapidly. Hardy Rand Ritter is more accurate and is used to test both congenital and acquired color blindness. More detailed color vision testing is done using Farnsworth–Munsell 100 hue test and D15 test as they are more sensitive. The FM 100 needs placement of 85 caps in 4 rows and D15 requires arrangement of 15 color discs according to their hue and intensity (Figure 1.15).
Impairment of visual functions
Published in Ramar Sabapathi Vinayagam, Integrated Evaluation of Disability, 2019
Ishihara, Holmes-Wright lantern tests, FM test (Farnsworth Munsell 100 hue test), and the wire test evaluate color vision (15,16). Integrated Evaluation of Disability assigns maximum impairment of 25% for loss of color perception (Table 13.6).
In-Office Power Bleaching
Published in Linda Greenwall, Tooth Whitening Techniques, 2017
Joe C. Ontiveros, Rade D. Paravina
It is not justified to recruit experienced practitioners or female observers for visual monitoring of tooth bleaching because there is insufficient evidence that experience and gender influence shade-matching performance for observers with normal color vision. However, significant evidence shows that differences exist among individuals of the same gender or people with similar experience. These differences can be quantified through various professional (nondental) tests such as Ishihara charts or the Farnsworth–Munsell 100-hue test. In the latter test, color discrimination ability of color-normal individuals ranges from low (16%), through average (68%), to superior (16%). There is also evidence that education and training can improve one’s color-matching skills.
Reduced ability to discriminate colours – an under-recognised feature of depressive disorders? A pilot study
Published in International Journal of Psychiatry in Clinical Practice, 2022
Eberhard A. Deisenhammer, Anna Strasser, Georg Kemmler
The study procedure in all participants was conducted by the same author (AS) under the same standardised conditions. Participants were placed at a table with a white work surface in a dimmed room with daylight tubes providing 650 lux and 6500 kelvin. Study procedures were performed in the afternoon thus ruling out circadian influences. For the detection of colour discrimination differences, the Farnsworth Munsell 100-Hue test was used. This test kit consists of overall 85 colour buttons covering the entire colour spectrum arranged in four rows (row 1 from red to yellow, row 2 from yellow to green, row 3 from green to blue and row 4 from blue to red). The colour buttons are numbered underneath facilitating the distinction for the study arrangement since the colour differences are very small. The colour buttons are manufactured in the same colour saturation (chroma 6) and the same brightness value (value 6) thus ruling out the contribution of grey value differences to colour differences.
Effect of blue–blocking lenses on colour discrimination
Published in Clinical and Experimental Optometry, 2021
Manon Baldasso, Maitreyee Roy, Mei‐ying Boon, Stephen J Dain
Only one study using blue‐blocking spectacle lenses has been found. This study used the Farnsworth‐Munsell 100 Hue test (FM100Hue),18 but only considered untransformed total error scores (TESs) rather than looking specifically at blue‐yellow discrimination.19 Untransformed TESs are not normally distributed in normal subjects.20 In addition, the test is a poor predictor of small changes, since there are some significant practice effects.21,22