WLens
WAchromatic lens
WApochromat
WAspheric lens
WAxicon
WBaden-Powell's unilens
WBarlow lens
WBurning glass
WCataract surgery
WCoddington magnifier
WCrystal ball
WCylindrical lens
WDoublet (lens)
WEnChroma
WEyepiece
WFresnel lens
WGraphene lens
WHyperradiant Fresnel lens
WLens (anatomy)
WLens flare
WLenticular lens
WLuneburg lens
WMicrolens
WMultifocal diffractive lens
WNimrud lens
WObjective (optics)
WOil immersion
WPanomorph
WPU scope
WScheimpflug principle
WSELFOC Microlens
WThin lens
WTriplet lens
WVisby lenses