Whenever doing comparison shopping, questioning the value of a higher priced item over the lower priced one is only natural. The customer is rightfully interested in a purchase that delivers the best value. In fact, this questioning is necessary because automatically buying the most expensive or least expensive item guarantees that many of your purchases will deliver dissatisfaction rather than value. It all comes down to what "best value" means to you. For different people, this means different things, and at this point, little more can be said.
However, presenting various reasons for why you should and shouldn't buy 1.67 high index lenses vs standard CR-39 plastic lenses should help those who are undecided:
When 1.67 High Index Lenses Make
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Unworldly in this sense means an impression that the person reads too much at the expense of direct experience with the world. This and similar stereotypes are further reinforced by Hollywood. People simply see the thick lenses and the eye distortions produced by thick lens optics, and they will make quick associations with the common stereotypes.
Another problem with thick lenses is they obscure facial expressions made with the eyes. The eyes express your true emotional state. How can you tell the difference between a genuine and fake smile? By looking at the eyes. A genuine smile is accompanied by "smiling eyes." Even the toothiest fake smile is betrayed by the eyes, while smiling eyes make the person with a neutral mouth expression appear happy. When expressive eyes match the spoken word, you come across as genuine.
What this means is that thick glasses will get in the way of attempts at influencing another's initial impressions. During an interview for a job, your spoken word is less effective because the interviewer finds it more difficult to tune into your emotions as you express enthusiasm or laugh at the interviewer's