polarized lens
Also called polarizing lens, polarized sunglasses
A polarized lens is a spectacle lens containing a polarizing film that absorbs horizontally vibrating light, the main component of glare reflected from water, snow and roads.1 Light reflected from a horizontal surface is partly polarized in the horizontal plane, and fully polarized at Brewster's angle, so a film with its transmission axis vertical cuts reflected glare more than it dims the rest of the scene.1
The film works best when level, so tilting the head lets more glare through, and the lens blank cannot be rotated to set a cylinder axis.1 Polarized lenses can dim or hide liquid crystal displays and reveal stress patterns in tempered or laminated windshields, and the FAA does not recommend them for pilots.1,2
More detail
Polarization is not a spectral filter. The film can be paired with any tint, and a polarized lens blocks ultraviolet only because makers add an absorber.1
Pilots can also lose the glint of sunlight from another aircraft's wing or windshield, which shortens the time they have to see and avoid it.2
In a lab study of 45 young adults without refractive error, neither polarized nor nonpolarized sunglasses changed acuity, stereopsis or phoria.3
Sources (3)
- Brooks and Borish, System for Ophthalmic Dispensing, ch. 22, Absorptive Lenses
- Federal Aviation Administration. Sunglasses for pilots. Pilot safety brochure OK-24-1154, 2024.
- Ebrahimi F, Kangari H, Akbarzadeh-Bagheban A, Rahmani S. Effect of polarized sunglasses on visual functions. Int J Ophthalmol. 2025;18(12):2325-2330.
Reviewed October 2026