Lenses

About Lenses

The primary aim of spectacles is to help enhance a person’s vision and aid the correction of visual impairments, if any, though the recent times have seen a swelling list of its functions. To this end, corrective lenses are used. These lenses come with different specifications corresponding to individual requirements. Lens is dubbed as the all inclusive medicine for optical sickness. it varies for different optical needs. For corrective purposes,specific optical requirements are to be met otherwise plain lenses can be used. Lenses can be clear (indoor) or dark (outdoor) or photochromatic lenses that darken when exposed to sun. These lens specifications can be integrated into plastic, glass etc. The lenses can be embodied in different materials like glasses, plastics and polycarbonate materials.

Glasses

Are known for their scratch resistance and hardness prowess, but are easily breakable and guarantees very Little protection from Ultraviolet rays. The glasses are also too heavy for comfort.

CR39 (Plastic Polymer)

 The plastic lens, on the other hand, is lighter shatter resistant and ensures greater protection from UV rays though at the cost of inherent softness and scratch proneness.

Polycarbonate

 The Polycarbonate, a synthetic plastic material, is known for its high impact resistance, almost bullet proof resistant at point blank range. The impact resistance makes this lens highly preferred for sports wear, children’s wear and safety wear. Polycarbonate lenses are used for astronaut helmet shields and space shuttle windshields. Weighing only 35 percent of the plastic lens, it is one of the lightest ophthalmic materials. The in built protection properties offer 100% ultra violet blocking to about 400 nanometers.

Airwear

 Airwear is one of the new additions to the optical family. A material made from pure polycarbonate resin, Airwear is 43% lighter than ordinary plastics. The lightness does not in any way compromise on the impact resistance. Airwear lenses can also be made 35% thinner and 45% flatter than ordinary plastic lenses with no loss in optical performance. Airwear lenses provide anti reflective coating and promises 100% UV protection.

Aspheric

Aspheric lenses have arrived and they are here to stay, These models have emerged as a credible alternative to the traditional spherical lenses. With its advent, optical distortions are a thing of the past. As aspheric lenses do not bulge out of the frame as much as regular lenses, they are much more appealing to eyes. The fact that they lessen the magnification or minification of eyes, a problem for patients requiring strong correction, draw customers to this variety. Most lens designs can now be ordered in aspheric form.

High index

High index lenses have been introduced as a replacement for the cumbersome thick edged lenses. These are a variety of plastic materials that bend light more than conventional plastic. As a result, the high index lenses are lighter, thinner and flatter. . Highindex materials are available in hard resin plastic and extra impact resistant polycarbonate material.

Progressive

Progressive lenses offer greater visual correction than ordinary reading glasses and bifocals. These lenses have taken optical assistance closer to natural vision than ever before. They pull off an amazing feat by allowing good vision near, far and everywhere in between without annoying, distracting lines. This is why they are sometimes called no-line bifocals. Progressives provide a smooth transition from distance through intermediate to near, with all the in-between corrections included as well. This continuum of lens power provides a natural range of vision for patients. Unlike other lenses, progressives provide quality vision in the periphery. Introduction of compact lenses has added that dash of fashion to the exquisite line up. Progressive lens has, today, evolved to be the best product for those above 40, principally because the age group depends on glasses for all the practical needs of daily life. Progressives can double up as reading glasses as well as bifoca ls or trifocals, with enhanced clarity as the add on. Varilux Comfort, Varilux Panamic, Nikon Presio, Kodak, Kodak Precise, Kodak Concise are some of the major brands in this category. Nikon Web Lens, which offer a much large usable area for reading and computer work,is also a popular option today.