Importance of spectacles in today’s world.….. · A look at the lens materials in detail : -...
Transcript of Importance of spectacles in today’s world.….. · A look at the lens materials in detail : -...
We’ve been recalibrated to a high-definition world. We need to read 10-page documents on our smart phones. Our TVs show us every blade of grass and every whisker, and that’s the resolution we expect from our eyes.
And whether it’s reading emails, driving on highways or playing a round of golf, we rely on our eyes to give us the clear picture.
Having an eyewear that delivers continuous performance is essential to get the most out of life—and it all begins with the lens material recommendation you make ………
Importance of spectacles in today’s world.…..
Initially lenses were made only from Glass ..
Glass being brittle and dangerous when breaks - was used
for vision correction and placed in front of our most
precious organ – The Eye!
Evolution of lens materials …..
Then plastic lenses were introduced…
Starting from CR 39 1.50, to mid index (1.56) and high index plastic lenses like 1.60,1.67 etc.
New and improved lens materials: -
• Basic lenses
• Average thickness
• Used world wide
Standard plastic
• Upto 20 % thinnerlenses than plastic.
• Impact resistant
• Active lifestyle.
• 100 % UV cut.
• Not much suitable forrimless frames.
Polycarbonate• 35 % thinner than plastic
• High Impact resistant.
• High tensile strength.
• Unbreakable.
• Easy to tint
• Suitable for all frames.
• 100 % UV cut.
Trivex /Tribrid
• Thinner and lighterlenses.
• 100 % UV cut.
Other high index lenses
Subsequently new materials with advanced technologies were introduced like Polycarbonate, Trivex, Tribrid etc that were,
Tough Impact Resistant and With High Tensile Strength
A look at the lens materials in detail : -
Glass LensesOriginally, all lenses were made of glass, which while it made them very resistant to scratching, also made them very heavy and prone to breakage.
• Exceptional scratch resistance (don't need scratch resistant coating).
• Excellent optical clarity.
• Excellent opticAnti-reflective (AR) coating adheres to glass very well.alclarity.
Advantages:
• About 25 to 40 percent thicker than polycarbonate and high index plasticlenses
• At least twice the weight of plastic or polycarbonate lenses.
Can shatter or chip easier than lenses made of other materials.
• Require a special coating to provide 100% UV protection.
Disadvantages
Plastic CR 39 Lenses 1.50 and Mid index as 1.56
A look at the lens materials in detail : -
• Good optical quality.
• Lightweight - About half the weight of glass lenses.
• More shatter resistant than glass lenses.
• Plastic lenses accept tints easily with uniform grade colours.
• Affordable.
Advantages:
• About 20 to 35 percent thicker than polycarbonate or high index plasticlenses.
• Require scratch-resistant coating for added durability.
• Require a special coating to provide 100% UV protection
Disadvantages
it is more lightweight and thinner than glass making it comfortable to wear
A look at the lens materials in detail : -
High Index Plastic Lenses – 1.60 & 1.67
• Lightweight - Between plastic and polycarbonate lenses in weight.
• Thin - About 15 to 30 percent thinner than plastic lenses.
• Better peripheral optics than polycarbonate lenses (for prescriptionsunglasses).
• Cosmetically more attractive.
• flatter shape of the lens will make things look less distorted towards theedges of your lenses.
Advantages:
• Requires scratch-resistant coating for durability.
• Regular mid high index lenses are less impact resistant than Polycarbonate
• More lens reflections than glass or plastic lenses (AR coating recommended).
• Expensive
Disadvantages
Mid and high index lenses are for people with a high prescription. They allow spectacle lenses to be made thinner, lighter and flatter than previously possible.
A look at the lens materials in detail : -
Polycarbonate Lenses
• Excellent impact-resistance - 10 times more impact resistant than otherlenses.
• Thin - About 20 to 25 percent thinner than plastic or glass lenses.
• Lightweight - About 20 percent lighter than plastic lenses.
• Blocks 100 percent UV rays without needing a special coating.
Advantages:
• Requires scratch-resistant coating for durability.
• Peripheral vision may be slightly less clear in strong prescription powers.
• More lens reflections than glass or plastic lenses (AR coatingrecommended).
• Cracks while edging and mounting.
Disadvantages
Polycarbonate is one of the strongest and safest materials on the market.
A look at the lens materials in detail : -
Trivex and Tribrid lenses
Trivex material provides the complete package of optical quality, lightweight comfort, strength and protection—the critical performance characteristics called for in everyday living.
Disadvantage : Expensive !!!!
• High impact resistance than polycarbonate
• High tensile strength than polycarbonate
• Unbreakable
• Easy to tint.
• Suitable for edging in rimless frames
Advantages:
A short summary : -
Crown Glass
CR 39 & Mid index
high index Ultra high index Polycarbonate Trivex & Tribrid
Refractive Index
1.52 1.50 & 1.56 1.60 & 1.67 1.74 1.59 1.53 & 1.60
Weight heavyAlmost half the weight of glass
lightweight lightweight lightweight lightweight
Thickness thick
Much less thicker than
glassReduced thickness
Reduced thickness Reduced thickness Reduced thickness
ImpactResistance
low medium medium medium high high
Tintability N/A good good OK medium good
Optical clarity goodgood good good good good
The new material from Vision Rx Lab that is superior to standard plastic and polycarbonate, is ideal for rimless frames and in an affordable price.
High Impact resistant
High tensile strength
Easier to drill & mount
Lighter 100 % UV cut Affordable
Introducing
Index :1.55, Specific Gravity :1.16,Abbe value :44,UV cut :400 nm
Product Features :-
Optical Quality – High index and high abbe value leads toincreased optical clarity & quality.
Thinner and lighter because of it’s high index.
High Abbe number minimises the chromatic aberration( prismatic effect) and provides comfortable vision.
High impact resistance and high tensile strength helps inwearer’s eye safety.
Highly recommended and suitable for rimless frames.
Good processability for modern design lenses.
Good weatherability causes no change in lens colour afteryears of usage.
Good compatibility with coating materials.
Lighter as compared to a standard plastic
excellent optical clarity
Safe X resistant to breakage
Standard plastic d Breaks
Crack occurred while drilling in polycarbonate
No Crack occurred while drilling in Safe X
Safe X Lens
High Impact Resistance
Thinner Lighter
High Tensile Strength
Better Tinting Options
High impact
resistance
Excellent toughness
Ideal for rimless
eyewear
Resistance to edge
breakageLighter
than polycarbon
ate
Blocks UV
Strong wear
resistance
Longer service
life
Crack Free Edging
Safe X is the ideal material …..
Abbe Value : 44
Specific Gravity : 1.16
Refractive Index : 1.55
UV Cut : 400 NM
Safe X
Abbe Value : 45
Specific Gravity : 1.11
Refractive Index : 1.53
UV Cut : 380 NM
Abbe Value : 31
Specific Gravity : 1.28
Refractive Index : 1.598
UV Cut : 400 NM
Polycarbonate Trivex
31
4445
34
36
38
40
42
44
46
Abbe Value
Polycarbonate
Safe X
Trivex
1.28
1.16
1.11
1
1.05
1.1
1.15
1.2
1.25
1.3
Specific Gravity
Polycarbonate
Safex
Trivex
Comparison in terms of material specification…..
Positioning…..
Polycarbonate
Tribrid
Abbe Value : 41
Trivex Abbe Value : 45
Safe X Abbe Value :45
1.60 Plastic Abbe Value :42
1.59 Polycarbonate Abbe Value :31
1.50 Plastic Abbe Value :58
Overview
1.53 Trivex
1.55 SafeX
1.60 Plastic
1.59 Polycarbonate
1.50 CR39
Expensive
Expensive
Best Price
Affordable
Cheap
Processing Thin Tensile Strength
Impact Resistance
Tint Edging Convenience
Affordable
1.60 Tribrid ExpensiveAbbe Value :41
Abbe Value :45
Abbe Value :45
Abbe Value :41
Abbe Value :31
Abbe Value :58
Clarity of vision
Who should wear Safe X lenses ….
Lenses made with Safe X material are a great choice for people with an active lifestyle, and expects clear vision , comfort and protection from their eyewear.
Prescription:-
Safe X provides maximum optical performance. One will gain the most from the benefits of Safe X material which provides an attractive and comfortably
thin lens, ideal for rimless frames.
Compatible with all lifestyles and frame styles...
For the fashion-conscious, lenses that provide optical quality, lightweight comfort, strength and protectionare always in style!
Safe X material is a perfect fit for all frame designs, and specially well-suited for rimless (drill-mount) andsemi-rimless (supra) styles.
AvailabilityFinished Single Vision Stock –
• T.S SV, Nova Plus SV, Nova Easy SV• Nova HD PAL, Nova 3Di PAL, Nova Tiny PAL ,
Nova Plus PAL , Nova Trendfree PAL• Nova Sport SV &Nova Sports PAL.• Nova OfficeAvailable with Satin , Satin + , Satin+ UV andSatin+ Blue coatings.
1.55 ASP Fino Safe-X UV 400 Satin ReliefPower Range - Total power -8 sph with maximum cyl -2, +4 sph /-2 cyl
Rx Portfolio
POS
leaflet
Poster
dangler
tent card