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Generally speaking, the prism correction is usually left empty in most prescriptions since majority of prescription glasses wearers will not have a prism measurement. And many people always feel confused that what the actual function for this correction if the values are added to the prescription glasses.
It is true that progressive multimodal glasses are very popular these days, because the multimodal lenses can give wearers all three ranges of vision(far distance, middle and near distance), but they also suffer the disadvantage of the power progression creating regions of aberration away from the optic axis. Some wearers find the visual discomfort caused by these distortions outweigh the benefits of wearing progressive glasses. So they prefer to wear lined bifocal glasses.
A lot of people wear sunglasses in summer and for myopic people, prescription glasses are needful on account of the sun shines strongly most of time in summer, people need to do some measures to protect themselves. As a result, sunglasses and prescription glasses are sold well on summer days. Most glasses shops have prescription glasses to sell. There are a variety of prescription glasses for customs to choose.
As can be seen, the situation of wearing glasses in college is more severe than in high school or senior high school. Just taking our dormitory for example, there’s only one of our four girls not wearing glasses and her eye-sight is now gradually becoming more and more poor. To other words, more and more students are getting closer to glasses and even we can say that glasses are necessities in student’s life. |
