- A blue line in vision may be caused by white blood cells moving in the capillaries in front of the retina of the eye. Blue light is absorbed by the red blood cells that fill the capillaries, and the eye and brain "edit out" the shadow lines of the capillaries1. However, if the problem is in both eyes, it may not be in the eyes but may be in the brain and could be caused by many things such as a compromised blood supply, inflammation, or even a nutritional deficiency. Therefore, anyone with symptoms such as these should have a full evaluation by an ophthalmologist2.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.The dots are white blood cells moving in the capillaries in front of the retina of the eye. Blue light (optimal wavelength: 430 nm) is absorbed by the red blood cells that fill the capillaries. The eye and brain "edit out" the shadow lines of the capillaries, partially by dark adaptation of the photoreceptors lying beneath the capillaries.en.wikipedia.org/wiki/Blue_field_entoptic_phenome…If it is in both eyes than the problem may not be in the eyes but may be in the brain and could be caused by many, many things such as a compromised blood supply (as in migraine), inflammation, or even a nutritional deficiency. Therefore, anyone with symptoms such as these should have a full evaluation by an ophthalmologist.www.aao.org/eye-health/ask-ophthalmologist-q/see…
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