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Tinted lenses

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Tinted lenses

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  2. 2. INTRODUCTION • TINT MEAN COLOUR LENSES. • TINTED LENSES WAS PURPOSE IN 1980. • TINTED LENSES ARE WORN IN GLASSES OR CONTACT LENSES. • TINT IS A ABSORPTIVE LENS. • TINTED LENS IS ALSO KNOWN AS ‘COSMETIC LENS’. 2
  3. 3. ABSORPTIVE LENSES • AN ABSORPTIVE LENS IS ONE THAT IS USED FOR THE SPECIFIC PURPOSE OF REDUCING THE AMOUNT OF TRANSMITTED LIGHT OR RADIANT ENERGY. • IT ACT AS A FILTER. • ABSORPTION MAY BE UNIFORM OR SELECTIVE. 3
  4. 4. TYPES OF ABSORPTIVE LENS • (1)TINTED LENS • (2)PHOTOCHROMATIC LENS • (3)POLAROID LENS 4
  5. 5. • Tints and coating used on spectacle lens Serve a fashion purpose can make vision More comfortable, can improve visibility And contrast and can protect the eye from effects of harmful radiations. 5
  6. 6. CLASSIFICATION OF TINT Tinted Lens Fixed Tint Integral Tint Surface Coated Dye tint Variable tint Glass Organic 6
  7. 7. INTEGRAL TINT • IT IS ALSO CALLED TINTED SOLID GLASS LENSES. • ONE OR MORE METALS OR METALIC OXIDES ARE ADDED TO THE BASIC BATCH AT THE TIME OF MANUFACTURING. • THEY PROVIDE THE DESIRED PHYSICAL AND CHEMICAL PROPERTIES. 7
  8. 8. • The principal ingredients of white ophthalmic crown glass are silica , soda & lime to which small amount of potassium , aluminum & barium oxides are added to provide the desired physical & chemical properties 8
  9. 9. • To produce a tinted lens , one or more metals or metallic oxides are introduced into the basic batch at the star of the process ( less than 1 % ) • Iron = green • Cobalt = blue • Gold = red 9
  10. 10. • Nickel = brown • Silver = yellow • Cerium = pinkish brown • Manganese = pink • Didymium = pink 10
  11. 11. Advantages : - They can be produced in large quantities at low cost - The transmission is affected very little by surface scratches - There is absence of reflections - No special equipments is needed for surfacing & finishing the lenses 11
  12. 12. • Disadvantages : - Variation in transmission from center to edge ( for lenses of high power ) no equi tint. - Variation in transmission from one eye to the other for pts with large amount of anisometropia 12
  13. 13. - The permanence of the tint ( it can not be removed ) 13
  14. 14. Surface coating • A lens is tinted by depositing a thin metallic oxide on the surface the lens • The coating is deposited on the lens by an evaporation process conducted under a vacuum at high temp • Because of high temp , the process can not be used with plastic lenses 14
  15. 15. • The density of the coated lens depends on the thickness of the metallic oxide • The coating is deposited on the back surface of the glass • To reduce the amount of light reflected by the coating , an AR coating is placed on the metallic oxide coating 15
  16. 16. • Advantages - possible to have equip tint lenses in any RX 16
  17. 17. • Disadvantages - only for glass - ARC should be done - Tint can vary with improper handling , scratches on the surface & general wear & tear 17
  18. 18. DYE TINT • Resin lenses can be tinted by immersing in a container of dye. • Red , yellow , blue are the three primary dyes from with which almost all other colours can be made. • The dye can be purchased either in powder or liquid from which are then mixed with previously boiled water. 18
  19. 19. • 92 to 96c temperature • The longer the lenses remain in the dye , the more dye will be absorbed. • Dye tint are not affected by the power of the lens. 19
  20. 20. Tinted plastic lenses • Plastic lenses are tinted by dipping them in a solution containing the appropriate organic dye • The resulting density depends on the nature of the dye & the length of time the lens is immersed in the solution • If the tint is too dark , or for any reason needs to be changed , some tint can be removed by dipping the lens in a bleaching solutions 20
  21. 21. • Advantages - very easy process - Any colour possible - Price factor 21
  22. 22. • Disadvantages - Glass lenses can not be done - Fades faster - Proper tint involves trial , error & lots of experience 22
  23. 23. -The color of dyed plastic lenses is not as stable as in glass lenses -Most dyed lenses fade with time -Same material from different manufacturing batch absorbs dye at dis-similar rates -An old lens may not tint same as a new one 23
  24. 24. YELLOW TINT • IT IS ALSO CALLED ASKALICHROME • CHROMIUM OR SULPHAR OXIDES ARE USED TO GIVE RISE TO YELLOW TINT FILTER. • SOME TIME URANIUM OXIDES CAN ALSO USED. • IT ABSORB SHORT VISIBLE WAVE LENGTH. • THESE LENSES ARE TRADITIONALLY USED AS A SHOOTING GLASS. 24
  25. 25. • YELLOW FILTER ABSORB BLUE,VIOLET AND UV LIGHT WHILE ALLOWING A LARGER PERCENTAGE OF OTHER FREQUENCIES THROUGH. • CONTRAST ENHANCE • CAR DRIVING • SKIING 25
  26. 26. RED TINT • MATERIAL IS SELANIUM. Red tint can be helpful for hue discrimination colour deficiency. a) skiing. a) hunting. b) sharply defind contrast. 26
  27. 27. PURPLE TINT • Allows 70 % of visible light transmittance inside and 20 % outside • Provides a natural color perception while shading the eye
  28. 28. GREY • Called as NEUTRAL LENS • Most popular for sunglasses • Evenness of transmission through whole visible spectrum • Allows colors to be seen in there natural state relative to one another • Thus satisfactory for use in color deficient
  29. 29. 1. Protection tint. 2. Reduce the intensities. 3. Protection against glare. 4. Driving 29
  30. 30. • For sun protection • Colour vision deficiency • Fishing • Boating • Driving 30
  31. 31. BLUE • Also called as alpha • Used in aphakics to reduce glare problems • Also to absorb the blue end of the spectrum which is the property of the lens • Small concentration of cobalt yield blue glass. • Blue tint is not advisable for outdoor work.
  32. 32. USES 1. Boiler tender. 2. smelters. 3. Foundry work. 4. Furnace work 32
  33. 33. GREEN TINT • Material is ferrous oxide metal. • It is also called as colobar. • Transmission curve closely approximates the color sensitivity curve of the human eye • Earlier popularly used in Military & Pilots • There is good absorption of UV and IR rays 33
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  35. 35. PINK TINT • Pink is an example of unsaturated red. • Cerium is added to the batch mix to give rise to pinkish tint. • Is is also called as sweetest colour. • Pink may be the colour of choice when there is some neurological problem. • Give for indoor work. 35
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  37. 37. • Used for unfavorable indoor lighting situations and best solution for problems such as change in lighting • It absorbs ultraviolet radiations 37
  38. 38. BROWN TINT • Brown tint is good general purpose filter. • Absorbs blue end in higher proportion than yellow • Commonly used to improve contrast on bright, hazy and smoggy days • It is an excellent contrast enhancing filter & is very much suitable for sun protection. • It is an ideal tint for drivers for day time. 38
  39. 39. G 15 TINT • A combination of both gray and green • Good option for sun glasses • Reduce glare • Reduce eye strain in bright light
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  43. 43. COMPANY • ZEISS • TRANSITION • DRIVE WEAR • CARRERA 43
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  47. 47. Images 47
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