Lens
A lens is a piece of transparent material that changes the directions of light coming in.
Lenses are in magnifying glasses and VR headsets. VR headsets use two lenses, one for each eye.
There are different types of lenses, including fresnel lenses and pancake lenses.
Lenses can be bunched together to form a lens array, which can be used for light field imagery.
VR headset lenses[edit]
VR headsets such as the Oculus Rift DK1 and DK2 use biconvex nonequiconvex lenses, meaning they are convex on both sides, but each side has a different curvature from the other.
Biconvex lenses are ideal for positive conjugate image ratios from 0.2 to 5.[1]
5X Packette Magnifier[edit]
- Bausch + Lomb 5X Packette Magnifier lens
The lens measures approximately 1 7/16" (36 mm) in diameter and has a 2" (51 mm) focal distance.
Injection molded PMMA lenses[edit]
Injection molding of PMMA eyepiece lenses involves heating PMMA pellets to about 130–180°C, injecting the molten material into a mold (often with multi-cavities for efficiency), and cooling under controlled conditions.