What type of light is recommended for use during dark adaptation to minimize interference with the eye's low-light vision?
Answer
Red-light flashlight.
When needing to consult notes or equipment during stargazing sessions after beginning the dark adaptation process, it is crucial to use a light source that minimally disrupts the rod cells responsible for scotopic (low-light) vision. Red spectrum light is scientifically determined to have the least impact on these specialized photoreceptors. While any bright light will cause temporary reduction in sensitivity, using a red light source allows the observer to regain a substantial portion of their night vision much faster than if they used white or blue light, which strongly bleach the light-sensitive pigments in the rods.
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