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[* black] But wait—if Fresnel lenses do away with the bulging curves of traditional lenses, why are these lenses curved?
[* black] Turns out, Oculus went a step further down the optical tunnel, and manufactured ''hybrid'' Fresnel lenses.
-[* black] These lenses are made up of concentric prisms of uniform thickness (like any other Fresnel lens). But an extra, sloping layer is added to the back of the lens, creating a shape that mimics a traditional curved lens—and allowing the ''magnification power'' to vary along the vertical axis of the lens.
+[* black] These lenses are made up of concentric prisms of uniform thickness (like any other Fresnel lens). But an extra, sloping layer is added to the back of the lens, creating a shape that mimics a traditional curved lens—and allowing the ''focus'' to vary along the vertical axis of the lens.
[* icon_note] That's why the Rift instructs you to focus the headset by simply pushing it higher or lower on your face. Look through a different part of the lens until you find the focus suited to your eyes. Bingo, no more three-sets-of-lenses Rifts.