• Redrawn from Basic and Clinical Science Course Section 2: Optics, Refraction, and Contact Lenses. San Francisco: American Academy of Ophthalmology; 1986–1987:39. Fig 3.
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    Related: Light beam, Optics
    Refractive Mgmt/Intervention

    A beam of light, consisting of pencils emanating from many point sources, that is being limited by an aperture.