Abstract
A color matching anomaloscope with improved precision in determination of color acuity in subjects is provided. The anomaloscope includes one or more reference light sources (e.g., light emitting diodes (LEDs) and two or more matching light sources (e.g., LEDs)). At least some of the light sources have distinct wavelengths from each other within the visible light spectrum. Color acuity (e.g., a color perception ability) of a subject is determined by a color matching examination in which the subject matches one or more reference colors by adjusting the intensities of the two or more matching light sources. In some examples, a quantitative assessment of color acuity of the subject is provided through an analytic method that uses normative wavelength-dependent cone sensitivities to quantify the subject’s cone sensitivities at one or more discrete wavelengths. In some examples, one or a series of binary decisions are presented, in which the subject determines whether one of two colors formed by different intensities of the matching light sources is a better match to the reference color.
[0007] The color matching anomaloscope can (a) quickly and efficiently characterize the type of a subject’s color vision acuity (e.g., normal vision, dichromacy, achromatopsia, anomalous trichromacy) and (b) provide a quantitative assessment of the subject’s cone sensitivities at one or more
discrete wavelengths, allowing for the determination of a quantitative description of the variation within the subject’s identified type of color vision acuity. The current state-of-the-art anomaloscope and Ishihara color vision tests cannot achieve these goals. In addition, the color matching anomaloscope has fewer parts with lower costs than traditional anomaloscopes.
[0008] An exemplary embodiment provides a color matching anomaloscope. The color matching anomaloscope includes a first reference light source configured to emit visible light over a first reference bandwidth. The color matching anomaloscope further includes a first matching light source configured to emit visible light over a first matching bandwidth distinct from the first reference bandwidth. The color matching anomaloscope further includes a second matching light source configured to emit visible light over a second matching bandwidth distinct from the first reference bandwidth and the first matching bandwidth. The color matching anomaloscope further includes a processing device configured to receive a reference light signal corresponding to light emitted from the first reference light source. The processing device is further configured to adjust one or more of a first intensity of the first matching light source or a second intensity of the second matching light source. The processing device is further configured to receive a first user input from a user indicating a match of blended light from the first matching light source and the second matching light source with light from the first reference light source. The processing device is further configured to receive a matching light signal corresponding to the blended light from the first matching light source and the second matching light source where the match is indicated. The processing device is further configured to determine a color perception ability of the user based on a comparison of the reference light signal with the matching light signal. [0009] In some embodiments, each of the first reference bandwidth, the first matching bandwidth, and the second matching bandwidth spans between 3 nanometers (nm) and 30 nm.
[0010] Another exemplary embodiment provides a method for determining color acuity of a user. The method includes controlling a first reference light source to emit visible light over a first reference bandwidth. The method further includes controlling a first matching light source to emit visible light over a first matching bandwidth distinct from the first reference bandwidth. The method further includes controlling a second matching light source to emit visible light over a second matching bandwidth distinct from the first reference bandwidth and the first matching bandwidth. The method further includes adjusting one or more of a first intensity of the first matching light source or a second intensity of the second matching light source. The method further includes receiving a first user input from a user indicating a match of blended light from the first matching light source and the second matching light source with reference light from the first reference light source. The method further includes determining a color perception ability of the user based on a comparison of the blended light indicated by the first user input with the reference light.
[0011] Those skilled in the art will appreciate the scope of the present disclosure and realize additional aspects thereof after reading the following detailed description of the preferred embodiments in association with the accompanying drawing figures
[0007] The color matching anomaloscope can (a) quickly and efficiently characterize the type of a subject’s color vision acuity (e.g., normal vision, dichromacy, achromatopsia, anomalous trichromacy) and (b) provide a quantitative assessment of the subject’s cone sensitivities at one or more
discrete wavelengths, allowing for the determination of a quantitative description of the variation within the subject’s identified type of color vision acuity. The current state-of-the-art anomaloscope and Ishihara color vision tests cannot achieve these goals. In addition, the color matching anomaloscope has fewer parts with lower costs than traditional anomaloscopes.
[0008] An exemplary embodiment provides a color matching anomaloscope. The color matching anomaloscope includes a first reference light source configured to emit visible light over a first reference bandwidth. The color matching anomaloscope further includes a first matching light source configured to emit visible light over a first matching bandwidth distinct from the first reference bandwidth. The color matching anomaloscope further includes a second matching light source configured to emit visible light over a second matching bandwidth distinct from the first reference bandwidth and the first matching bandwidth. The color matching anomaloscope further includes a processing device configured to receive a reference light signal corresponding to light emitted from the first reference light source. The processing device is further configured to adjust one or more of a first intensity of the first matching light source or a second intensity of the second matching light source. The processing device is further configured to receive a first user input from a user indicating a match of blended light from the first matching light source and the second matching light source with light from the first reference light source. The processing device is further configured to receive a matching light signal corresponding to the blended light from the first matching light source and the second matching light source where the match is indicated. The processing device is further configured to determine a color perception ability of the user based on a comparison of the reference light signal with the matching light signal. [0009] In some embodiments, each of the first reference bandwidth, the first matching bandwidth, and the second matching bandwidth spans between 3 nanometers (nm) and 30 nm.
[0010] Another exemplary embodiment provides a method for determining color acuity of a user. The method includes controlling a first reference light source to emit visible light over a first reference bandwidth. The method further includes controlling a first matching light source to emit visible light over a first matching bandwidth distinct from the first reference bandwidth. The method further includes controlling a second matching light source to emit visible light over a second matching bandwidth distinct from the first reference bandwidth and the first matching bandwidth. The method further includes adjusting one or more of a first intensity of the first matching light source or a second intensity of the second matching light source. The method further includes receiving a first user input from a user indicating a match of blended light from the first matching light source and the second matching light source with reference light from the first reference light source. The method further includes determining a color perception ability of the user based on a comparison of the blended light indicated by the first user input with the reference light.
[0011] Those skilled in the art will appreciate the scope of the present disclosure and realize additional aspects thereof after reading the following detailed description of the preferred embodiments in association with the accompanying drawing figures
| Original language | English |
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| Publication status | Submitted - 2019 |