Single Vision Stock / Grind Private1 month ago - Multimedia - Sâmraông - 15 views
Single Vision Stock / Grind
Single vision lenses are those that have the same focal power throughout the lens. They can be used to treat short-sightedness, far-sightedness or astigmatism.
Progressive lenses and the advantages of having them
Progressive lenses are no-line multifocal eyeglass lenses that look exactly the same as single vision lenses. In other words, progressive lenses will help you see clearly at all distances without those annoying (and age-defining) "bifocal lines" that are visible bifocals and trifocals.
Blue cut lenses block 40% of this hazardous light thanks to a filter added to these glasses. This filtration is more than enough to restore proper blue light levels reducing adverse effects. Wearing blue light filter glasses protects your eyes as well as your health!
What are photochromic lenses made of?
Photochromic lenses are made of molecules composed of trace amounts of silver chloride (the same chemical compounds used to develop film). When this silver chloride is exposed to ultraviolet light, the molecules become silver metal, allowing the lenses to absorb visible light and turn darker in the process.
The difference between photochromic and Transitions lenses
The difference between photochromic lenses and Transitions lenses is that Transitions is a brand of photochromic lenses — one of several brands.