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Tinted lenses
This document discusses different types of tinted lenses, including their purposes and materials. It covers integral tints produced during manufacturing by adding metals or metal oxides to glass. Surface coatings deposit metallic oxides onto glass through evaporation. Plastic lenses are dyed by immersing them in organic dyes. Various tint colors like yellow, red, purple, and brown are explained in terms of the materials used and their applications. Integral tints provide consistent tinting while surface coatings and dyes allow tinting of any prescription.
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Tinted lenses
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- 2. INTRODUCTION • TINT MEANCOLOUR 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. ABSORPTIVE LENSES • ANABSORPTIVE 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. TYPES OF ABSORPTIVELENS • (1)TINTED LENS • (2)PHOTOCHROMATIC LENS • (3)POLAROID LENS 4
- 5. • Tints andcoating 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. CLASSIFICATION OF TINT Tinted Lens FixedTint Integral Tint Surface Coated Dye tint Variable tint Glass Organic 6
- 7. INTEGRAL TINT • ITIS 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. • The principalingredients 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. • To producea 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. • Nickel =brown • Silver = yellow • Cerium = pinkish brown • Manganese = pink • Didymium = pink 10
- 11. Advantages : - Theycan 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. • 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. - The permanenceof the tint ( it can not be removed ) 13
- 14. Surface coating • Alens 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. • The densityof 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. • Advantages - possibleto have equip tint lenses in any RX 16
- 17. • Disadvantages - onlyfor glass - ARC should be done - Tint can vary with improper handling , scratches on the surface & general wear & tear 17
- 18. DYE TINT • Resinlenses 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. • 92 to96c 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. 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. • Advantages - veryeasy process - Any colour possible - Price factor 21
- 22. • Disadvantages - Glasslenses can not be done - Fades faster - Proper tint involves trial , error & lots of experience 22
- 23. -The color ofdyed 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. YELLOW TINT • ITIS 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. • YELLOW FILTERABSORB BLUE,VIOLET AND UV LIGHT WHILE ALLOWING A LARGER PERCENTAGE OF OTHER FREQUENCIES THROUGH. • CONTRAST ENHANCE • CAR DRIVING • SKIING 25
- 26. RED TINT • MATERIALIS SELANIUM. Red tint can be helpful for hue discrimination colour deficiency. a) skiing. a) hunting. b) sharply defind contrast. 26
- 27. PURPLE TINT • Allows70 % of visible light transmittance inside and 20 % outside • Provides a natural color perception while shading the eye
- 28. GREY • Called asNEUTRAL 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. 1. Protection tint. 2.Reduce the intensities. 3. Protection against glare. 4. Driving 29
- 30. • For sunprotection • Colour vision deficiency • Fishing • Boating • Driving 30
- 31. BLUE • Also calledas 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. USES 1. Boiler tender. 2.smelters. 3. Foundry work. 4. Furnace work 32
- 33. GREEN TINT • Materialis 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. PINK TINT • Pinkis 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. • Used forunfavorable indoor lighting situations and best solution for problems such as change in lighting • It absorbs ultraviolet radiations 37
- 38. BROWN TINT • Browntint 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. 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. COMPANY • ZEISS • TRANSITION •DRIVE WEAR • CARRERA 43
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