Usually you should try to stay in the same type of lens you have worn previously. Your eyes would have become use to seeing through this particular matter and changing the material will cause some initial misrepresentation. It is suggested to avoid polycarbonate lenses in high plus prescriptions.However, this question does not have a simple answer as there is no one single lens that is better as there are several factor’s that one needs to take into consideration when deciding which lens is best for you. There are many different manufacturers with different makes of products.
The higher your prescription lens, the higher the index that you will need. A standard lens is considered to be 1.5 index. In the plastic materials the usual choices are 1.6, 1.67 and 1.74. In glass material the standard lens is 1.6, 1.7, 1.8 and 1.9. Although glass lens is available in higher indexes than the plastic, the glass lens is usually quite a bit heavier than its plastic counterpart.
Another reason a person may with a high index lens is to have a finished pair of spectacles that are thinner, lighter and more comfortable to wear.
The choice of spectacle frame will further influence the final finished look. Generally the smaller the frame the better the finished lenses will be.
An aspheric lens design will usually give a thinner and nicer appearance and often better peripheral vision. All high index lenses need an anti-reflection coating to reduce unwanted reflections from the lens surface. Most high index lenses come with the coating as standard.
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