Difference between revisions of Close-up glasses
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→When are differentials worn
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Read a book with differentials. Use your computer with differentials. | Read a book with differentials. Use your computer with differentials. | ||
Wear your differential glasses any time you are doing close work. If you have to get up to go to the bathroom, switch back to your normalized glasses. You get used to it pretty fast. | Wear your differential glasses any time you are doing close work. If you have to get up to go to the bathroom, switch back to your normalized glasses. You get used to it pretty fast. "What if I just need to look out my window for like a minute?" CHANGE YOUR GLASSES. If you are asking yourself "should I switch to normalized glasses to look outside the [[blur horizon]] of my differential glasses?" the answer is always YES. | ||
But for convenience, you might choose a threshold time and not change your glasses if it would be worn for less than that threshold. As an example, see the [[20-20-20 rule]] page. | |||
'''What is "close" work?''' Norms minus diffs = the number of diopters you need to convert to find this answer. For example, if your normalized glasses are -5 and your differential glasses are -3.5, then you need to convert -1.5. You should be able to see 66.67cm with -1.50 myopia! That's about 26.24 inches, or a little more than 2 feet. | '''What is "close" work?''' Norms minus diffs = the number of diopters you need to convert to find this answer. For example, if your normalized glasses are -5 and your differential glasses are -3.5, then you need to convert -1.5. You should be able to see 66.67cm with -1.50 myopia! That's about 26.24 inches, or a little more than 2 feet. | ||