GLASS OPHTHALMIC LENSES

Glass Ophthalmic Lenses are available in Regular, Tinted, photo-chromatic, hi-index and Anti-Reflecting Coating.

• Suitable for indoor activities, under artificial lighting.
• A cosmetic line of subtle shades.
• Compatible PC with thick lenses (positive power lenses and multifocals).

Very Fast Fading (Photochromics)

In the sun, they will darken in few seconds to a B1 tint. Their transmittance is then around 48%.
When removed from the sun, lenses will fade in only 5mm and A tint. They will rapidly reach 80% transmittance to stabilize around 85% under normal lighting.

HI-INDEX LENSES

These are a type of glass having higher refractive index. They are recommended for high power prescriptions in order to reduce the thickness of the lenses. This is particularly more effective in high minus where it reduces the thickness of the lens and proportionately the weight, compared to ordinary glass of the same power. It further enhances the cosmetic look by largely eliminating the peripheral concentric rings present in high minus powers.

Regular Lens	High - Index Lens

A Lens minus lens in Hi-Index with Anti-Reflection coating can really make your spectacles feel like as though you are wearing a frame alone. The Lens looks absolutely in conspicuous. Hi-Index lenses are available in clear white glass tinted glass and photochromatic glass version.

ANTI-REFLECTION COATING

The A.R. coating is a film coated on the surfaces of opthalmic lenses to combat glare from reflecting sources at working place and the dazzle from the head lights of oncoming vehicles while driving at night.

Conventional Lenses	Lenses with Multi Coated

The A.R. coating is also available in high power glasses especially minus where  it enhances the cosmetic value of the spectacles: Lenses without antireflection coating transmits only 92% of light through the lens and the remaining 8% is reflected. With Anti- reflection coating, the transmission can be increased to 99% from 85%, thus improving the clarity of vision and eliminating ghost images of objects viewed.

Advantages :

• Eliminating Reflections.
• Filter out Ultra-Violet Light
• Makes your glasses lens conspicuous and hence more attractive.
• Reduces eye fatigue in office and under artificial light.
• Helps to avoid glare during night driving from an on coming car headlight.

Indoors, all  lenses are as clear as light tints - but they add a systematic attenuation of the blue spectrum.

Outdoors,   lenses combine UV cutting and attenuation - by half of the visible light.