Difference between revisions of 3 hour rule
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* Try not to exceed 3 hours of close-up time. | * Try not to exceed 3 hours of close-up time. | ||
If you do near work for 4 hours or more, it is likely you will have ciliary spasm and it may be more difficult to make improvements. | If you do near work for 4 hours or more continuously, it is likely you will have ciliary spasm that is harder to resolve and it may be more difficult to make improvements. | ||
==Videos== | ==Videos== | ||
{{#ev:youtube|kIuN9Jjxccg}} | {{#ev:youtube|kIuN9Jjxccg}} | ||