TYPES OF COATINGS APPLIED TO SPECTACLE LENSES

This presentation is about types and uses of coating in spectacles for adapting in different environment and lifestyle.

1. TYPES OF COATINGS APPLIED TO SPECTACLE LENSES By: RAHUL K.V. Optometrist

2. Why Coating is Done? Protection Appearance Clarity Fog

3. Types of coatings commonly applied. MAR Coating Tints UV Coating Scratch Resistant Coating Mirror Coating Polarized Coating Edge Coatings

4. MAR( multiple anti-reflection ) coatings (anti-glare/non-glare) Allows maximum Transmission. Hydrophobic. Oleo-Phobic. Anti-Static. Enhanced vision in low light Intensity.

5. Anti-Reflective Coating Anti-reflective coating (also called AR coating or anti-glare coating) is a microscopically thin multilayer coating that eliminates reflections from the front and back surface of eyeglass lenses. By doing so, AR coating makes your lenses nearly invisible so people can focus on your eyes, not distracting reflections from your eyeglasses. Anti-reflective coating also eliminates glare caused by light reflecting from your lenses. So it provide better vision for night driving and more comfortable vision for reading and computer use.

6. TINTS (dyes) Tinted lenses can reduce glare, improve contrast, and enhanced depth perception.   Sure, celebrities seem to love to shade their eyes in an array of colored sunglass lenses, but tinted lenses are more than merely a fashion accessory. They can have a huge impact on your performance as an athlete, spectator, and lover of the great outdoors.

7. Grey Tinted Lenses : Anti-fatigue True color perception Dark enough to provide overall protection Reduces glare, especially off water Used by baseball, tennis, football, soccer, water sports, and all other outdoor activities Blue Tinted Lenses : Reduces glare Helps to see contours Improves color perception More useful for spectator and golf

8. Yellow Tinted Lenses : Provides greater clarity in fog, haze, and other low-light conditions Filters out blue light that can make focusing difficult Used by skiing, mountain biking, hunting, aviation and target shooting Brown/Amber Tinted Lenses : Improves contrast Contains a red element to enhance depth perception Used by fishing, boating/sailing, or any sport where distance needs to be judged

9. Red/Pink Tinted Lenses : Enhances visual depth Reduces eye strain Provides good road visibility Used by Cycling, racing Green Tinted Lenses : Transmits all colors evenly Good for general purpose use Dims glare while brightening shadows Used by All outdoor activities

10. Polarized coating Made for SunGlasses. High Tech Film-—-molecules of polarizing agent placed in specific order to block specific wavelength of light which is percieved as glare. Reduces Glare Allows to see clearly with less eye strain. Used in: Water Sports, fishing, sailing. Limitations: VDU Screens, LCD’s, Mobile, ATM.

11. UV Coating Done by Bathing in UV solution before colouration. Used for protective purposes. Used by skiers, mountaneers, astronomers and Used by Pseudophakics. Normal coatings transmitt 5% while best quality coatings allow only 2% UV rays.

12. Mirror Coatings Applied to front surface of sunglasses only. Prevents the appearance of eyes. Can Decrease the optical clarity or effect negatively the properties of lens. It is used for cosmetic purpose only.

13. Scratch Resistant Coating (Hard multi coating – HMC ) Applied to all plastic, trivax and Polycarbonate lens. Makes soft lens surface the properties of hard surface. May be applied to Front, back or both surfaces of a lens.

14. 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

15. 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

16. Edge Coating Applied to plastic lenses, Specially 3 Piece and Half Rimless fittings. It makes the edges of lens appear like the colour of the frame. It is only used for a high minus lens .