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


• 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


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.


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.


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



UV Cut : 380 NM

Abbe Value : 31



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

importance of spectacles in today’s world.….. · a look at the lens materials in detail : -...

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