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Specialty Lenses
Progressive power lens is constructed with a large stable distance zone (upper) and a smaller near zone (lower), with a progressive power intermediate zone (middle) in between them. The lens gives a completely "invisible" and unnoticeable transition multifocal, allows a complete and unbroken focusing range from distance through intermediate to near. The main reasons for the fast decreasing in the use of the conventional bifocals by the presbyopes are the noticeable dividing line in between the distance/near segments that "give-away" to the wearer's age and the "image jump" when the eyes travel from the distance to the near segment, and the lack of intermediate range. In contrast to the conventional bifocals, progressive power lenses are cosmetically attractive, they do not have any "image jump" and the wearers enjoying a gradual and continuous vision from distance to reading. Since the first progressive lens available in the market in 1950, extensive
research into designing and manufacturing the progressive power lenses
have led to the present state-of-the-art lenses, with minimum peripheral
aberration and less "swinging" sensation, faster adaptation and excellent
visual comfort.
Polycarbonate Lenses are made from an advanced aerospace material. It was primarily used as industrial safety lens material because of its tremendous strength and recently it is being used to produce high tech products such as CD, LD and bullet-proof screen. Today, polycarbonate material is commonly used in visual optics. While no lens is completely shatterproof, polycarbonate lenses offer the highest level of impact resistance available. They're 10 times stronger than ordinary plastic lenses, 60 times stronger than glass lenses. They're also 37% lighter than ordinary plastic lenses, 57% lighter than normal glass lenses, and 26% thinner than ordinary plastic lenses. Polycarbonate lens has an excellent built-in Ultra-violet rays protection which screens out 99% of the harmful UV rays. They are multicoated to eliminate light reflection from any direction especially during night driving, computer works etc. They are the first choice of lenses particularly for:
Transitions Lenses provide the physical comfort of light-weight plastic lenses and visual comfort of photo-sensitive tint that darken in the sunlight and back to its original neutral light tint when indoors. The neutral light tint reducing glare from harsh over head lighting or computer screen and reducing eyestrain. They do more than just reduce glare and squinting when in the sunlight,
they block harmful UV rays. Transitions provide
the highest UV protection of any photochromic lens - indoors or out at
all times. The durability of the lenses is extended with a scratch-resistant
coating.
Hi-Index Lenses are made with either plastic or glass material, coupled with anti-reflection multicoating. They reduce the myopic lens thickness and the "rings" at the edge significantly as compared with normal lenses. Plastic hi-index lenses (high grade) are produced with aspherical design in combination with a flatter base curve to minimize distortion at the edge of the lens. These lenses offer the lightest weight of all lenses for maximum comfort, and impact resistance for safety. The accompanied multi-layer anti reflection vacuum coating also eliminates distracting reflections, such as flickering and ghost images. The lens surfaces are treated with a scratch resistant hard coating and a special hydrophobic (water repellent) coating for easy water tarnishing removal. The added advantage is the built-in UV rays protection of the lens material. Due to the difference in thermal expansion coefficient between the organic (plastic) lens material and its surface coating materials, it is necessary to take some care to avoid coating cracks as follows:
Aspherical Lenses are made with the aspheric front curves of plus lenses flatten as they approach the edge of the lens and the curves of minus lenses steepen near the edge. This creates a flatter, thinner and lighter lenses, and a remarkable improvement in wearing comfort. The unique aspheric surface design in combination with the low base curve minimizes distortion at the edge of the lens, providing exceptionally clear vision and better cosmetics. Aspheric lenses provide a more natural look because the lenses sit closer to the eye (the result of their flatter curves). This produces less magnification for plus lenses and less of the "small eyes" look associated with strong minus lenses. |