color_blindness
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| color_blindness [2026/07/27 22:51] – [Molecular basis for color vision] gary1 | color_blindness [2026/07/27 22:52] (current) – [Molecular basis for color vision] gary1 | ||
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| =====Molecular basis for color vision===== | =====Molecular basis for color vision===== | ||
| *in humans and Old World primates, color vision is dependent upon three types of retinal cone cells with each cone cell type having a specific opsin tuned to either long, medium, or short wavelengths of light, roughly corresponding to red, green, and blue, and mutations or other defects in cone cell function can lead to vision deficits | *in humans and Old World primates, color vision is dependent upon three types of retinal cone cells with each cone cell type having a specific opsin tuned to either long, medium, or short wavelengths of light, roughly corresponding to red, green, and blue, and mutations or other defects in cone cell function can lead to vision deficits | ||
| - | *the light-absorbing molecule is 11-cis-retinal which is converted to all-trans retinal when activated by light which is released from the cell and this must be converted back to 11-cis-retinal then taken up by the cell for re-use | + | *the light-absorbing molecule is 11-cis-retinal which is converted to all-trans retinal when activated by light which is then released from the cell and this must be converted back to 11-cis-retinal then taken up by the cell for re-use |
| *membrane-facing lateral openings in cone pigments which are absent in rhodopsin, the rod-cell pigment responsible for low-light vision. | *membrane-facing lateral openings in cone pigments which are absent in rhodopsin, the rod-cell pigment responsible for low-light vision. | ||
| * these openings may help explain why cone pigments regenerate much faster, enabling continuous color vision in bright light | * these openings may help explain why cone pigments regenerate much faster, enabling continuous color vision in bright light | ||
color_blindness.txt · Last modified: 2026/07/27 22:52 by gary1