Tinted lenses

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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’.
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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.
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4. TYPES OF ABSORPTIVE LENS
•(1)TINTED LENS
•(2)PHOTOCHROMATIC LENS
•(3)POLAROID LENS
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5. •Tints and coating used on spectacle lens
Serve a fashion purpose can make vision
More comfortable, can improve visibility
And contrast andcan protect the eye
from effects of harmful radiations.
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6. CLASSIFICATION OF TINT
Tinted
Lens
Fixed Tint
Integral
Tint
Surface
Coated
Dye tint
Variable
tint
Glass Organic
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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.
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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
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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
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10. •Nickel = brown
•Silver = yellow
•Cerium = pinkish brown
•Manganese = pink
•Didymium = pink
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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
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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
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13. -The permanence of the tint ( it can not be
removed )
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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
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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
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16. •Advantages
-possible to have equip tint lenses in any RX
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17. •Disadvantages
-only for glass
-ARC should be done
-Tint can vary with improper handling
, scratches on the surface & general wear &
tear
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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.
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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.
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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
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21. •Advantages
-very easy process
-Any colour possible
-Price factor
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22. •Disadvantages
-Glass lenses can not be done
-Fades faster
-Proper tint involves trial , error & lots of
experience
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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
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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.
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25. •YELLOW FILTER ABSORB BLUE,VIOLET AND UV
LIGHT WHILE ALLOWING A LARGER
PERCENTAGE OF OTHER FREQUENCIES
THROUGH.
•CONTRAST ENHANCE
•CAR DRIVING
•SKIING
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26. RED TINT
•MATERIAL IS SELANIUM.
Red tint can be helpful for hue discrimination
colour deficiency.
a) skiing.
a)hunting.
b)sharply defindcontrast.
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27. PURPLE TINT
•Allows 70 % of visible light transmittance
inside and 20 % outside
•Provides a natural color perception while
shading the eye

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. 1.Protection tint.
2.Reduce the intensities.
3.Protection against glare.
4.Driving
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30. •For sun protection
•Colour vision deficiency
•Fishing
•Boating
•Driving
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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. USES
1.Boiler tender.
2.smelters.
3.Foundry work.
4.Furnace work
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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
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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.
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37. •Used for unfavorable indoor lighting
situations and best solution for
problems such as change in lighting
•It absorbs ultraviolet radiations
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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.
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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
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47. Images
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