Single vision is the most common type of prescription lens. This lens type features a single field of vision, or one prescription power throughout the entire lens, for correcting nearsightedness (myopia) or farsightedness (hyperopia). These are lenses which have a single power over the whole lens. Single Vision lenses are commonly used by people below 40 yers of age. They require focus power only to see the distant objects. The prescribed Power may be either Spherical or Cylindrical or the combination of two. 

When your eye doctor says you should consider bifocals, your first thought might be, “OMG, I’m getting old! You’re not old—you just need reading glasses now on top of your other glasses, and bifocals are a more convenient option than carrying around two pairs of glasses.

  Bifocal lenses have two viewing areas divided by a visible line: a larger viewing area for distance with a smaller segment for reading.

It may take first-time bifocal wearers some time to adjust to the lenses. This is largely due to learning how to move your eyes between the distance and reading portions of the lens. Some people also find the “image jump” that occurs at the visible line between the distance and the reading areas obtrusive, especially for those with mobility issues that must look down when walking. The best thing to do to get used to your bifocals is to wear them as much as possible.

The D-Bifocal is also same as Bi-Focal , The onle difference is the Shape of the bottom area where your reading power is distributed. As the name say it is similar to D shape.

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Standard progressives are multi-focal lenses with three viewing areas: distance-, intermediate-, and near-vision. Unlike bifocals, there is no visible line between each viewing area. They have a seamless, invisible design where the power “progressively” changes throughout the lens

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The primary viewing area in a progressive lens is for distance, with a smaller area at the bottom of the lens for near vision, and an even smaller area for intermediate vision in the middle. Standard progressives are great for all-purpose glasses, with the emphasis on distance-vision activities like driving and walking, and adequate areas in the lens for near-vision activities such as reading and computer use. The left and right sides of the lens, or “lobes,” are intentionally blurry to achieve the invisible design. The clearest vision in a progressive is top-to-bottom in the center of the lens.

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Anti-reflective coating (also called "AR coating" or "anti-glare coating") improves vision, reduces  eye strain and makes your eyeglasses look more attractive.

These benefits are due to the ability of AR coating to virtually eliminate reflections from the front and back surfaces of your eyeglass lenses. With reflections gone, more light passes through your lenses to optimize visual acuity with fewer distractions (especially at night), and the lenses look nearly invisible — which enhances your appearance by drawing more attention to your eyes and helping you make better "eye contact" with others.Today's modern anti-reflective coatings can virtually eliminate the reflection of light from eyeglass lenses, allowing 99.5 percent of available light to pass through the lenses and enter the eye for good vision.

Photochromic lenses are eyeglass lenses that are clear (or nearly clear) indoors and darken automatically when exposed to sunlight.

Other terms used for photochromic lenses include "light-adaptive lenses" and "variable tint lenses."

The most popular brand of photochromic lenses is Transitions , but there are other brands of photochromic lenses available as well.

The molecules responsible for causing photochromic lenses to darken are activated by the sun's ultraviolet radiation. Because UV rays penetrate clouds, photochromic lenses will darken on overcast days as well as sunny days.

Photochromic lenses typically will not darken inside a vehicle because the windshield glass blocks most UV rays. Recent advancements in technology allow some photochromic lenses to activate with both UV and visible light, providing some darkening behind the windshield. Ask your optician for details.

UV light and other forms of higher-energy light,come out not just from skies.They also come to us from cloudy or rainy skies,and even in reflected light. Short term exposure to UV rays can cause photokeratitis which is sunburn of the eye.Over a long period ,it can lead to cataracts. As for the light we can see, it is made up in part of high-energy visible light (HEV light),which is known to potentially cause Age-related Macular Degeneration (AMD) as we get older.

With the help of Blue Control Lens we can get 100% protection from UVA and UVB rays, Protection from harmful blue light and better contrast gives more accurate color and depth perception