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Limits of Human Perception

... out of the visual spectrum. This applies to night vision and dark-adapted vision. The dark-adapted eye utilizes the rod cells as opposed to the cone cells of daylight vision; rod cells are more photosensitive and more numerous, but they lack th...

The Eye and Night Vision

The basic structure of the eye is shown in Figure 1. The anterior portion of the eye is essentially a lens system, made up of the cornea and crystalline lens, whose primary purpose is to focus light onto the retina. The retina contains receptor cells...

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