March 10th, 2008 by statuseyecare
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Photochromic lenses are mostly used by people who are mainly exposed to the UV rays of the sun. The color of the lenses changes from light to dark depending upon its exposure to the sun. Previously one could choose only among glass lenses but today one can even choose from plastic lenses. There are various names given to these Photochromic lenses such as Transitions, Reactolite, Reactions and even known as Graduations. But in totality these lenses are known as photo chromic lenses. But the name Transition is a brand name of the photochromic lenses. The photochromic lenses from Transition are the most advanced lenses but there are many lenses available in the markets which are also very advanced in technology. The photochromic lenses are made for the protection of your eyes from the UV rays of the sun and practically clear. These lenses can produce a tint effect depending upon the amount of UV rays falling on them. The tint effect is more on a bright sunny day as the UV rays present is more and similarly on a dull day these photochromic lenses can change its color to a pale tint as the UV rays present is not much. Again when you come back to your house and you are inside then these lenses again become clear. The basic idea behind these photochromic lenses are that they should provide protection against the harmful UV rays of the sun and also from the changing effect of the sunlight. But you should remember that while you are outside the car these lenses tend to tint more whereas when you are inside the car the tinted effect is not much as the windscreen of the car does provide UV protection.
The two most popular types of photochromic lenses are Transition lenses and Reactolite lenses. Transition lenses are available in various forms such as in Standard Plastic, Poly Carbonate, 1.6 and 1.67 lenses. These lenses are made from very advanced technology and are the very fast to react to the UV rays of the sun. They take not more than 30 seconds to react and it is within this short span of time that they even get clear. Reactolite is another brand name of glass photochromic lenses. These lenses take a longer time than the transition lenses to react and are much heavier than those lenses. But the plus point of these lenses is that they are much more effective when someone is driving a car. But most of the time it is seen that transition lenses are much widely used as the comfort provided by these lenses is immense.
Mail Us at info@statuseyecare.com or Contact Us at +919322679910 or Vist Our Showroom At Status Eye Care , Shop No 5-a, Modi Chawl, Station Road, Santacruz-west ,Mumbai-400054 , India For More details
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March 8th, 2008 by statuseyecare
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Gone are the days where people wearing prescription eyeglasses were teased for their thick glasses. Now trendy and light weight eyeglasses are available for people who need corrections in their vision. The thick eyeglasses used in the previous decades were uncomfortable to wear and they reduce the confidence of the person wearing it. People wearing prescription eyeglasses were considered away from the fashion kingdom.
With the great advancements in the glass manufacture technology lenses are now made using different materials. Thin lenses are now manufactured using high index plastic material. They have good optical quality and they are of light weight compared to the conventional glass and plastic lenses. The prescription lens requires two properties – the refractive index of the lens and the curvature. When the lens has a higher refractive index, it can bend more light and thus curvature can be minimum leading to a thin lens.
High index lenses are now made using glass or plastic depending on the needs. When the material has high index of refraction, it will be dense and hence lesser material is used in making lens leading to a thinner one. The higher the refractive index of the material, the thinner is the lens made out of it.
People who suffer from myopia mostly use high index lenses for their eyeglass. High index lenses have great advantages for people who wear minus power. The thinning in these types of lenses is uniform and hence gives you a trendy look. For people who have power in the plus region, the thinning of lenses is at the center and it will not be visible. To avoid this problem, aspheric lenses are used. Aspheric lenses are mostly made of high index material and they serve the cosmetic purpose. They also give clear vision which is the main purpose of wearing the eyeglass.
The high index lenses have certain advantages and disadvantages over conventional lenses. On the positive side, these lenses are very flat and thin, giving the wearer the look of an elegant chic. They are also shatter proof and are robust. They can be curved and fitted to frames to give a trendy look. On the negative side, the eyeglasses that use high index lenses are expensive. A separate scratch resistant coating is to be given on the lenses to prevent scratches.
The new advancement in the lens manufacture technology is the use of ultra high index material. These materials provide the ability to manufacture very thin and flat prescription lenses for people who wish to be at the height of fashion. People with higher prescriptions like +/-10.00D can make use of ultra high index lenses for a very thin and flat eyeglass. The cost of the lenses increases with the decrease in their thickness. Thinner and flatter lenses are made out of high index material as these lenses have flat front curves. The aspheric curves deployed in these lenses provide distortion free clear vision with flat and thin structure.
We at Status Eye Care , Mumbai , India are expert in Dispensing Ultra Thin Hi-Index Lenses. Email us at info@statuseyecare.com or Contact us at +919322679910. We will be glad to assist you with your queries regarding Hi-Index Lenses.
Mail Us at info@statuseyecare.com or Contact Us at +919322679910 or Vist Our Showroom At Status Eye Care , Shop No 5-a, Modi Chawl, Station Road, Santacruz-west ,Mumbai-400054 , India For More details
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March 8th, 2008 by statuseyecare
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People who wear prescription glasses will be wearing an eyeglass with thick lens. It is generally said that those people are bookish and they are not fashion conscious. But many people who wear prescription glasses also wish to look trendy. The trendy eyewear must have a thinner lens. When you are able to reduce the thickness of your eyewear then you will feel confident that you have also achieved the trendy look. When you tint your lens with a cool color then nobody will believe that you are wearing prescription glass.
To achieve this fashionable look, you may use high index plastic lenses in your eyeglass. These lenses will have a higher index of refraction. The conventional prescription lenses are determined by the index of refraction and the curvature of the lens. The index of refraction refers to the ability of the lens material to bend the light ray. If the rays are bent by the lens, then curvature will be less. When the curvature is less, thin lenses can be made. Since high index plastic lenses bend light rays, their curvature is less and hence they can be made thin.
High index lenses are available with different indices as 1.70, 1.66, 1.60 and so on. When the number is large, the lens will be thin. Their tensile strength is also high and they can be used in drill mounted eyeglasses.
Every coin has two sides. They are certain disadvantages with the high index lenses. When the index is high more and more light is reflected off the surfaces. This leads to the decrease in the amount of light that is transmitted to the lenses. An ordinary plastic lens whose index is 1.498 reflects 8% of the light and allows the rest to pass through the lens. A high index lens whose index is 1.70 reflects 13.6% thus offering more resistance to the light that is transmitted through the lens.
Lenses that are made up of high index plastic tend to cause dispersion of light. When white light is passed through a high index lens, then it will break into its component colors. Due to this property you may find a color hue around certain images when you use eyeglasses made of high index plastic. This phenomenon is called chromatic aberration. This color hue tends to increase as you move your eyeballs away from the center of the lens. This effect can be avoided by the use of frames which are smaller in size. You will need one day to get your eyes adapted to eyeglasses with high index lenses.
Apart from minor flaws, the high index lenses are sure to offer you a trendy look. Seek the advise from your optician to carefully choose the index of the lens for a clear vision.
We at Status Eye Care , Mumbai , India are expert in Dispensing Ultra Thin Hi-Index Lenses. Email us at info@statuseyecare.com or Contact us at +919322679910. We will be glad to assist you with your queries regarding Hi-Index Lenses.
Mail Us at info@statuseyecare.com or Contact Us at +919322679910 or Vist Our Showroom At Status Eye Care , Shop No 5-a, Modi Chawl, Station Road, Santacruz-west ,Mumbai-400054 , India For More details
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