Spectacle Lens Designs

Glass

Glass lenses are available in White, Pink and Photo-chromatic (Grey and Brown). Glasses are heavier compared to CR39 lenses. The risk of breakage is also very high in the case of glass lenses.

CR-39 (Plastic Lenses)

• 50% Lighter as compare to a mineral lens
• Very good optical quality
• Some protection from UV rays
• Better impact resistance as compared to a mineral lens

Polycarbonate

• Poly carbonate lenses are 30% lighter than traditional plastic lenses.
• The lightness gives you greater comfort and you feel as if your not wearing any lenses at all. Polycarbonate lenses are more impact resistant than standard plastic lenses.
• They can withstand shock like, falling off a motorbike, much more easily. Optimal scratch resistance is attained when anti-reflective coating is applied to the lenses. Also ultraviolet rays are dangerous to your eyes.
• For this reason polycarbonate lenses provide 100% protection against harmful UVA and UVB radiation.
• Due to their extraordinary thinness, Polycarbonate lenses are perfectly suited for lightweight, discrete frames and ideal for kids, because of the impact resistance and UV protection. It is also ideal lens material for Rimless and Semi-Rimless frames.

High-Index Lenses

• These are a type of glass/plastic 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 the ordinary glass of the same power.
• It further enhances the cosmetic look by largely eliminating the peripheral concentric rings present in high minus powers.

Anti-Reflection Coating

• The Anti-Reflection (A.R) coating is a transparent film coated on the surfaces of ophthalmic lenses to combat glare from reflecting sources at working place and the dazzle from the head lights of oncoming vehicles while driving at night.
• Eliminating reflections
• Filter out Ultra-violet light.
• Makes your glass lens inconspicuous and hence more attractive.
• Reduces eye fatigue in office and under artificial light.
• Helps avoid glare during night driving from an oncoming car headlight
.

Photo-Chromatic Lenses

• These lenses change color depending on the environment they are in. When the lenses are directly exposed to UV light (Sunlight), they change color and become dark. When they are brought indoors, they automatically change from dark to clear white lenses.
• When they are dark, they give the effect of wearing sunglasses. These are available for glass lenses only. They are available in grey and brown.

Transitions

• These are color changeable lenses available for CR-39 (plastic) lenses. Transition lenses are clear indoors, They achieve even greater indoor clarity when combined with an anti-reflective coating.
• They are comparable to sunglasses in bright sunglasses and tint mildly in indirect sunlight. In high temperatures, they offer the darkest outdoor performance of all variable tint lenses.
• When the light changes, they are the fastest adjusting lenses, so you always see clearly and comfortably.
• These lenses block 100% of the sun's harmful UVA and UVB rays and are scratch-resistant. Transition lenses are up to 50% lighter in weight than glass. Transition plastic lenses are more impact resistant than glass.

Bi-Focal Lenses(3 types available)

• Kryptok(Fused)
• Executive(One Piece)
• Univis-"D"-Fused


1. What are Trifocals ?

Trifocals are those lenses which have three distinct fields of vision in the same lens; one for distance, one for intermediate and one for near. Each field is divided by a dividing line. The chief advantage of these is that they provide a more extended visual field. They have two major disadvantages:

The added line makes adjusting more difficult.

They are not cosmetically appealing.

2.What are Progressive Lenses?

These are multifocal lenses that provide the full range of focus from near to intermediate to far - gradually, without separations or interruptions. These lenses have no seams or lines and look exactly like normal single vision lens. These require an initial period of training and adjustment for the first-time wearer. These are available in plastic and glass.

VARILUX is an example of a progressive lens available in Plastic, High index(Polycarbonate) & Ultra-High index with Photochromatic options (Transition Lenses).

PROGRESSIVE LENSES

1. What are Progressive Lenses?

Progressive lenses, also called progressive addition lenses (PAL), progressive power lenses, graduated lenses,and varifocal lenses, are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation.

The wearer can adjust the additional lens power required for clear vision at different viewing distances by tilting his or her head to sight through the appropriate part of the vertical progression.

The lens location of the correct addition power for the viewing distance usually only requires small adjustments to head position, since near vision tasks such as reading are usually low in the visual field and distant objects higher in the visual field. Progressive addition lenses avoid the discontinuities (image-jumps) in the visual field created by bifocal and trifocal lenses and are more cosmetically attractive.

Since bifocal and related designs are associated with 'old age', proponents have suggested the lack of segments on the lens surface of a progressive lens appears more 'youthful' since lenses associated with younger wearers [single vision] lenses tend to be free of segments or lines on the surface.