Immediately say: do not worry choice "glasses or lenses?" If the doctor (ophthalmologist is, not an optometrist in the store) said something, and another to show you, then rejoice and order something, and more. Because each of the methods of vision correction has its pros and cons, alternating as needed, glasses and lenses, you avoid the disadvantages and collect all the pros.
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There are many different lenses with different material, design, mode of wear, durability, etc fundamentally different soft and hard contact lenses. Soft lenses, unlike hard, have a much lower probability of accidentally dislodged or fall out of the eye, in addition, they are much easier and more comfortable with virtually the first donning.
But when soft lens absorbs moisture, dries, it loses its flexibility and becomes brittle and rigid lens has constant properties, regardless of whether it is wet or dry. Rigid lenses provide sharper and clearer image. Astigmatism is easily corrected with using hard lenses, and it is much harder, and sometimes impossible, soft lenses.
Another advantage of hard lenses is that they are more durable and much easier to clean from contamination.
Modern contact lenses can solve almost all problems of that previously solved only points. In addition, contact lenses - one way vision correction, which is effective in cases where the correction glasses do not give the desired result.