At Vision Express India we provide the best spectacles lenses which suit your needs. Available best lenses, eyeglasses for men, women and kids. Step into nearest store and choose the best spectacles lenses for your eye.

1. Spectacle Lenses

2. Spectacle Lenses
• Spectacle Lensmaterials:
Materialsforspectacle lensesmustcomplywiththe followingoptical characteristics:
• Good optical homogeneity
• Highluminoustransmission
• Low scatteredlightcreation
• Chemical resistance
• Temperature resistance
• Good mechanical resilience
1. Mineral / Glassmaterial Lenses:
• Glasslensesare the oldestmaterial usedforspectacle lensesbutrarelyusedtodayasit isbrittle
and heavy.
• Theyhave excellentopticspropertiesandare scratchresistantbutunfortunatelytheyare
approximately33 percentheavierthantraditional plasticlenses(CR39) andthe leastsafe forimpact
resistance.
Advantages:
• Hightransparency
• HighAbbe Value
• Highlyscratch resistant
• Good Optical Quality
• Resistanttochemical fumesandtemperature fluctuation
• Available inphotochromatic&sunglassoption
Refractive Index:
• Mineral 1.5

3. • Mineral 1.60: 20% thinnerthanMineral 1.5
• Mineral 1.70: 30% thinnerthanMineral 1.5
• Mineral 1.80: 40% thinnerthanMineral 1.5
• Mineral 1.90: 50% thinnerthanMineral 1.5
Disadvantages:
• Heavy
• Easilybreakable
2. Organiclensmaterial lenses:
Advantages:
• Hightransparency
• HighAbbe Value
• PopularOptical material
• Good Optical Quality
• Resistanttochemical fumesandtemperature fluctuation
• Available insunglassoption –photochromatic,tintandpolarised
Refractive Index:
• Organic1.50 (CR39): 40% lighterthanmineral lenses
• Organic1.6 : 20% thinner&lighterthanorganic1.5
• Organic1.67 : 35% thinner&30% lighterthanorganic1.5
• Organic1.74 : 43% thinner&32% lighterthanorganic1.5
Disadvantages:

4. • Thickerthan glass
• Gets scratchedwhennotcoated
3. Polycarbonate Material:
Advantages:
• 23% thinner&25% lighterthanOrganic1.50
• 12 timesmoreshatter-proof thanOrganic1.50
• Has a veryhighimpactresistance –ideal forprotective eyewearandsportsglasses
• Has a veryhighmechanical resistance
• Can be groundverythinly – verylight
• Good optionforrimlessandkidsasit has highimpactresistance
Refractive Index:
• Available in1.6index only
Disadvantages:
• Has a tendencytogetstressinducedcracks
• Low scratch resistance –is systematicallyproducedwithahard coating
• Can be tintedtoa limiteddegree
• Polycarbonate hasa lowerabbe numberleadingtoloweroptical image properties
4. Trivex Material:
Advantages:
• 20% thinnerthanOrganic1.50
• lightestlensmaterial

5. • Ideal forrimlessframes
• 12 timesmoreshatter-proof thanOrganic1.50
• Has almostthe same refractionindex asCR39 butcan be groundmore thinly
• Has a veryhighimpactresistance–ideal forprotectiveeyewearandsportslenses
• Is chemicallyresistanttosolvents
• Has verygood optical characteristics
• Is with1.11 g/m3the lightestmaterial forlenses
• Is toughand hard-wearing–easytodrill,groove andcut
• Providesanalternative toOrganic1.50 as a standardlensbecause itislighterandtougher
• Is systematicallyproducedwithahard coating
• Trivex hasbetteroptical image propertiesthanpolycarbonate.
Refractive Index:
• Available in1.53index only
• Anti-reflectionCoating:
• To improve boththe visionthroughthe lensesandthe whole appearance of the glasses,ananti-
reflectivecoatingcanbe appliedtothe lenses.ARcoatingsmake the lensesclearertolookatand
through.
• Theyconsistof several layersof metal oxidesappliedtothe frontor back lenssurfaces.Because
of the layeringeffect,ARcoatingssometimeshave ahintof greenorpurple colour,dependingonthe
individualmanufacturer’sformula. Eachlayerisscientificallycalculatedtoblockreflectedlight.The
resultisthat you’ll see areductioninglare,annoyingreflectionsandhalosaroundlightswhilewearing
the lenses.Thisisagreat safetybenefitwhenyou’re drivingatnight.
• Anti-reflectivecoatingreducesbothinternal andexternalreflectionsonthe lensesthemselves,
creatinga nicercosmeticappearance.Internal reflectionsappear,asringsthat make lenseslookthick.
External reflectionsmaskyoureyesfromaclear,complete view whensomeone islookingatyou.So
withan anti-reflective coating,lensesappearthinornon-existent,andyoureyeslookmore natural.

6. • Anyone onTV or whose photo istakenoftenbenefitstremendouslyfromthe betterappearance
of ARcoated lenses,butreally,all eyeglasswearerswouldbenefitfromananti-reflective coatingfroma
cosmeticpointof view.If youhave a strongprescription,youcanuse the AR coatingin conjunctionwith
high-index orthinnerlensestomake yourglasseslookandfeel asthinaspossible.
• Tints:
• While some peoplethinkcolouredcontactlensesare merelycosmeticfunctions,the righttint
can enhance visionandcomfortat specific tasks,frominthe office infrontof a computerscreen,to
outdooractivitiessuchasgolf or skiing.Tintscome insolids,gradientsordouble gradients,andcanbe a
fununique touchto yourlenses.
• Pinkor Rose:
• Thistint hasbeenknowntohelpreduce eyestraininbrightly-litoffices.Thistintisoften
recommendedforcomputerwearers.
• Yellow:
• Oftenknownasblue blockers,yellow tintsare afavorite of skiersandskeetshootersbecause
theyprovide excellentdepthperceptionandlow light contrast.
• Yellowlensesare notrecommendedwhenaccurate colorperceptionisnecessary.
• Brown:
• Similartothe yellowtint,browntintsprovideexcellentcontrastbecause theyfiltersome blue
light,butnot as muchas the yellowtint.
• Brown lensesare excellentgeneral purposelenses.
• Green:
• The human eye ismostsensitivetogreenlight.Because of this,greentintsgiveusthe highest
contrast andgreatestvisual acuityof any tint.
• Greentintscan enhance contrastin low-lightconditions.

7. • Gray:
• The most populartint,a gray tintprovidesgoodprotectionfromglare anddoesnotoverly
distortcolors.
• Gray tintedlensesare excellentforgeneral purpose andfordriving.
• Purple:
• A goodchoice for hunters,purple tintsallowsfornatural colorperceptionwhileofferingsome
shade fromthe sun.
• Blue:
• Blue tintsare not recommendedforoutdooruse because itcanincrease glare.Itcan be usedas
a fashiontintif usedinlightershades.
• If blue colouredcontactlenses are desiredforoutdoorwear,be sure toconsiderthe optionof a
brownor gray polarizedlenswithablue flashmirrorcoat
• AsphericLenses:
• The asphericlensdesignthatcan be usedinmost lensmaterials.
• The designof the lenscreatesa flatter,thinnerandlessdistortedlensthantraditional designs.
• In general itachievesthisbychangingthe radiusof curvature the furtherfromthe centerof the
lens.
• Asphericlensesare anexcellentchoice forpluspoweredlenses
• Asphericscanbe alsocombinedwithhighindex materialsanditcreatesanexcellentdesignfor
cosmeticandoptical purposes.
• PolarizedLenses:
• Polarizedlensesare usedforprescriptionsunglasses.
• Polarised filtersare made of a chemical filmappliedtoatransparentplasticorglasssurface.

8. • The chemical compoundusedwill be composedof moleculesthatnaturallyaligninparallel
relationtoone another.
• Whenapplieduniformlytothe lens,the molecules create amicroscopicfilterthatabsorbsany
lightmatchingtheiralignment.
• Most of the glare that causesyouto wear sunglassescomesfromreflectionoff of horizontal
surfaces,suchas wateror a highway.
• Whenlightstrikesasurface,the reflected lightwavesare polarizedtomatchthe angle of that
surface.So,a highlyreflective horizontal surface,suchasa lake or the sea,will produce alot of
horizontallypolarizedlight.
• The polarizedlensesinsunglassesare fixedatan angle thatonlyallowsverticallypolarizedlight
to enterthe eye hence reducingthe glare.
• PhotochromaticLenses:
• Photochromiclensesare eyeglasslensesthatdarkenautomaticallywhenexposedtosunlight,
thenfade back whenyoureturnindoors.
• In mostcases, photochromic lensesare clear(ornearlyclear) indoorsanddarkentoa medium
suntint outdoors.Butthere are exceptions.
• Photochromiclensesare available innearlyall lensmaterialsanddesigns,includinghigh-index
lenses,bifocalsandprogressive lenses.
• An addedbenefitof photochromiclensesisthattheyshieldyoureyesfrom100 percentof the
sun’sharmful UVA and UVB rays.
• Because a person’slifetime exposuretosunlightandUV radiationhasbeenassociated
withcataractslaterinlife,it’sagood ideatoconsiderphotochromiclensesforchildren’seyewearaswell
as for eyeglassesforadults.