The binocular has easily adjustable eyecups that ... the BX-4 is advertised as completely waterproof and fogproof. The lenses on the BX-4 Range HD are coated to be scratch and smudge-resistant.

We've rounded up the best binoculars for bird-watching currently on the market, complete with our expert reviews on the pairs to buy.

The new Zeiss SFL 50 is available in three magnifications and delivers 50mm performance in a 42mm-sized frame for under $2,000.

these rangefinders edge over the competition in terms of optical quality thanks to their fully multi-coated glass lenses and prisms. Read more below Best for technical proficiency Best for ...

Although we needed to set up the head, the lenses screwed in securely and easily. As the binocular eyepieces came in 10X and 20X, we achieved a range of magnification from 40X to 2000X ...

binocular vision and eye movements. Refraction errors can also be identified using a refractor, which uses convex lenses to examine how the eye processes light.

Essilor has revealed its latest varifocal lens, the Varilux Physio extensee, designed to provide the optimum correction for each wearer’s pupil dynamics to reduce high-order aberrations and support ...

Enter the Kenko VC Smart Cellarto 10x30 WP binocular. Photographers will know this brand because of Kenko’s Tokina lenses, ...