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Nowadays, more and more people suffer from vision problems due to daily stresses and the widely use of computers, prescription glasses are a widely used method to help people correct the vision problems. For certain wearers who have a strong prescription, the first thing that they reach for when they wake up in the morning everyday are their prescription glasses. They can’t live without them because when they are not wearing, all they could see is blur. It is not hard to tell the importance of glasses to them. In order to help people choose the best comfortable prescription glasses, you may want to spend a bit time read through the following article, especially for some strong prescription. When choosing prescription glasses, the most concern for those people who have a high prescription is the thickness and weight of the lenses. Generally speaking, there are four factors that will affect the thickness of your glasses: frame size; lens index; prescription value and PD (pupillary distance).
As a general rule, the stronger your prescription is, the thicker the lenses center will be for near-sighted prescription. On the opposite, the thicker the edge of the lens will be for far sighted prescription. If you choose a frame with the smallest size possible, you will get a much better appearance than lager size frames because the thick edge will be grinded during lab processing for myopia lenses, and the center thickness can be reduced by reducing the lenses diameter for presbyopia lenses. Lens index is another important factor that will contribute to the lens thickness of a lens. It is well known that lenses with higher index have great advance on lenses thickness and self weight without compromising optical quality. In general, a 1.67 high index lens is as much as 35% thinner than the standard CR-39 lens [index 1.50] for the same prescription. For a far-sighted prescription, it is also recommended to choose a high index lenses aspheric design, for the reason that it could reduce chromatic aberration and edge distortion giving good all round vision. The fourth and final factor is your Pupillary Distance. You should always choose a frame with a total width suitable to your PD value. For instance, if you have a PD of 65mm, frames with total width of 130-140mm, which is 10mm allowance above your PD value times by two. Otherwise lenses with larger diameters have to be used. And they are thicker than ordinary lenses in 65mm diameter.
To achieve the best overall aesthetic result and get the most comfortable wear, you should take all above mentioned factors into consideration. If you are still having problems about selecting prescription eyeglasses, please feel free to consult the eye specialist. Their helpful and knowledgeable customer service experts will give you the professional advice about the most suitable frame and lenses upon reviewing your prescription so that best overall aesthetic result is achieved while keeping the cost to minimum.[ad_2]
write by Radley