Recommendations and requirements for the wavelengths in Rayleigh equation anomaloscopes

DIN 6160:2019 is a technical standard that sets requirements for Rayleigh equation anomaloscopes. Table 1 of the standard contains the limits for centroid wavelengths and spectral half power bandwidths (SHBW). The centroid limits are more restrictive than dominant wavelength recommendations. The SHBW limits have no known evidence base and are inconsistent between colors. The spectral characteristics of three commercial anomaloscopes brands were measured using a telespectroradiometer. Only the oculus instruments complied with DIN 6160 Table 1, but all the anomaloscopes complied with published recommendations. All complied with the DIN 6160 bandwidth requirements. This highlights the need to provide an evidence base for such requirements

The specification of color limits in eye protection lenses for use when color-contingent clinical observations are made

Objective: To investigate if color limitations in eye and face protection standards are sufficient to avoid interfering significantly in color-contingent clinical decisions. If not, to propose what requirement will ensure appropriate products. Methods: Yellow-tinted eye protectors, blue-blocking lenses and lightly tinted filters were assessed for compliance with eye and face protection standards and their effect on the color rendering. Results: Yellow-tinted eye protectors and many tinted filters cause significant noncompliance with hospital lighting recommendations and standards; however general eye protection standards do not exclude these lenses. The standard for eye protection against intense light sources, in cosmetic and medical applications (ISO 12609-1), does exclude lenses identified as affecting clinical color-related decisions significantly. Conclusions: Any recommendation or standard for eye and face protection for persons making color- contingent clinical decisions must include the requirement of ISO 12909-1. Persons making color-contingent clinical decisions should be advised to use only untinted or neutral-colored lenses. Clinical Significance: This research is intended to advise writers of standards and recommendations on eye and face protection for use where color-contingent clinical decisions are made to ensure that the protector does not interfere with these decisions. It is also intended to advise on the selection of tints in their eye protection

Colour vision deficiency.

Colour vision deficiency is one of the commonest disorders of vision and can be divided into congenital and acquired forms. Congenital colour vision deficiency affects as many as 8% of males and 0.5% of females--the difference in prevalence reflects the fact that the commonest forms of congenital colour vision deficiency are inherited in an X-linked recessive manner. Until relatively recently, our understanding of the pathophysiological basis of colour vision deficiency largely rested on behavioural data; however, modern molecular genetic techniques have helped to elucidate its mechanisms. The current management of congenital colour vision deficiency lies chiefly in appropriate counselling (including career counselling). Although visual aids may be of benefit to those with colour vision deficiency when performing certain tasks, the evidence suggests that they do not enable wearers to obtain normal colour discrimination. In the future, gene therapy remains a possibility, with animal models demonstrating amelioration following treatment