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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>Variants (also called mutations) in several different genes can cause achromatopsia. Most of the genes that are associated with achromatopsia are known to play important roles in the normal functioning of cones. Variants in the CNGA3 and CNGB3 genes are the most common causes of achromatopsia.</p><p>The CNGA3 and CNGB3 genes provide instructions for making different parts (subunits) of the cyclic nucleotide-gated (CNG) channel. These channels are found exclusively in cones and play an important role in a process called phototransduction. During phototransduction, rods and cones translate light into electrical signals. To help with this process, CNG channels transport positively charged atoms (ions) across the cell membrane and into cells. This movement of ions helps generate an electrical signal that is sent to the brain for interpretation.</p><p>Some of the variants in the CNGA3 and CNGB3 genes that are associated with achromatopsia cause cells to produce fewer CNG channel subunits, while other variants cause cells to produce subunits that do not function properly. These changes impair the function of the CNG channels, which disrupts the flow of ions across cell membranes and impairs the cell&#x27;s ability to generate electrical signals.</p><p>Some people with achromatopsia do not have one of the gene variants known to cause the condition. In these individuals, the cause of the disorder is unknown.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/achromatopsia/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Achromatopsia?"},{"bodyHtml":"<p>There are two types of achromatopsia: complete and incomplete. People with complete achromatopsia cannot perceive any color; they see only black, white, and shades of gray. People with incomplete achromatopsia can see some color.</p><p>People with achromatopsia may have additional problems with their vision, including an increased sensitivity to light and glare (photophobia), involuntary back-and-forth eye movements (nystagmus), and significantly reduced sharpness of vision (low visual acuity). Affected individuals may also have a small visual blind spot (scotoma), farsightedness (hyperopia), or nearsightedness (myopia).</p><p>Achromatopsia is different from the more common forms of color vision deficiency (also called color blindness), in which people can perceive color but have difficulty distinguishing between certain colors, such as red and green. One form of color blindness, called blue cone monochromacy (BCM), is sometimes considered a form of incomplete achromatopsia.</p><p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/achromatopsia\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"achromatopsia","sourceDocuments":[{"name":"Achromatopsia","reviewed":"2025-08","sections":{"causes":{"fetchedAt":"2026-10-20T20:19:03.938002+00:00","label":"Causes","pageSha256":"57638f3649775cc56a80f9731b88f729a3f3090c07eaec894f3ec4f4e10cb93d","sourceUrl":"https://medlineplus.gov/genetics/condition/achromatopsia/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/achromatopsia"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. 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