lens coatings
- 1. HARD COATING : • Hard coating provides the glass best scratch resistance and • most durable ingredient for a Anti reflection coating • Most common types of hard coating are : • 1.Thermally cured dip hard coating 2.U.V cured hard coating • 1. Thermally curved dip hard coating : in this coating the lens is slowly made to pass through liquid bath of a solvent based hard coat where the coating
- 2. solution adheres to both convex and concave sides of the lens. • 2.U.V cured hard coating : A liquid hard coat solution is applied to the concave slide of the lens using a process . lenses are then curved under a uv light for a specific amount of time.
- 3. SMUDGE RESISTANT COATING : • smudge resistant coating done to protect the glasses from • smudge such as oil , dirt , fingerprint etc.., • smudge free coating improves the coating durability • smudge resistant acts as scratch resistance to the glasses
- 4. Anti fog coating : • Anti fog coating is used to prevent the condensation of water in the form of small droplets on a surface which resembles fog • This coating works either by the application of a surfactant film • or by creating a hydrophilic surface • lens fogging is caused by when the lenses are significantly cooler than the surrounding air temperature . so, to avoid fog of lens we use anti fog coating
- 5. Crizal prevencia : • crizal prevencia glasses are glare , smudge ,scratch ,uv ,water resistance • Recently studies say that the blue- violent light is being harmful to • harmful to retinal cells it accerlates the onset of age related macular degeneration . (amd) • crizal prevencia is blue violent light resistance