LENS GUIDE

LENSES 

Single vision: a single vision lens is designed to correct vision for only one distance (i.e. only reading or only distance). Unlike bifocal or progressive lenses, which have multiple zones for different distances, single vision lenses have just one optical prescription through the entire lens. 

Bifocal: a bifocal lens is designed to correct vision at two different distances (i.e. distance and reading). The lens is divided into two distinct sections, generally with the distance prescription in the upper-part, and the reading section in the lower part (a visible line or boundary separates them in the lens).  

Multifocal/ progressive: a multifocal (or progressive) lens is designed to include multiple prescriptions for multiple distances, and without the visible or distinct line of a bifocal. They include a gradient of increasing prescription from the top to the bottom of the lens. The top of the lens is typically for the distance prescription, the middle part for intermediate vision (i.e. computer work), and the bottom part for near vision (i.e. reading). 

LENS OPTIONS/ ADD-ONS

Tinted: A lens tint refers to the colour coating applied to glasses to turn them into sunglasses. 

Polarised: A polarised lens is designed to reduce glare in bright settings, generally included in sunglasses. As light waves travel in many directions, polarised lenses block horizontal light waves (typically responsible for glare) while still allowing other light waves to pass through, so wearers can still see through the lens clearly. 

Transition/photochromatic: Photochromatic lenses can automatically adjust their tint based on lighting conditions. They darken when exposed to sunlight (UV activated), and return to a clear and lighter state when indoors or in low-light environments. However, it’s important to note that they may not darken significantly inside a car, as most cars have a UV shield in the windscreen. 

LENS COATINGS

Anti-reflective coating: An anti-reflective coating, also known as an anti-glare coating, is a thin layer applied to lenses to reduce reflections and improve visual clarity. 

Anti-fog coating: An anti-fog coating is a treatment applicated to lenses to prevent them from fogging up due to temperature changes or high humidity. The coating creates a hydrophilic (water-attracting) layer on the lenses that spreads moisture evenly across the surface, rather than allowing it to form droplets. This reduces the formation of fog and keeps the lenses clear. 

Blue-light coating: An anti-reflective coating with additional protection against blue light. Useful for those who use screens and devices on a daily basis.

Mirror coating: A mirror coating can be added to the front surface of the lenses to create a highly reflective and colourful appearance. Mirror coatings are very popular for sport and cycling glasses.