Difference between revisions of Close-up glasses
Jump to navigation
Jump to search
→When are differentials worn
| Line 36: | Line 36: | ||
== When are differentials worn == | == When are differentials worn == | ||
Standard EM advice is to wear differentials when looking at static focal planes (e.g. 2D planes like screens, books) at fixed distances for extended periods of time. It is okay to wear normalized in other contexts, such as when eating a meal, or looking at your conversation partners. It is also permitted to wear differentials in other close-up contexts based on personal preference, but there is no need to overdo normalized/differential glasses changes. (for example, there is no need to swap to differentials whenever someone walks up to you for a conversation) | Standard EM advice is to wear differentials when looking at static focal planes (e.g. 2D planes like screens, books) at fixed distances for extended periods of time. The main activities EM warns about include screen work, media consumption, and checking phone notifications. It is okay to wear normalized in other contexts, such as when eating a meal, or looking at your conversation partners. It is also permitted to wear differentials in other close-up contexts based on personal preference, but there is no need to overdo normalized/differential glasses changes. (for example, there is no need to swap to differentials whenever someone walks up to you for a conversation) | ||
To determine if a close up activity is hurting your vision with the glasses you are using (differentials or normalized), it helps to have a point of comparison (like a line on a snellen chart), and to compare against that reference point before and after the activity in question. | To determine if a close up activity is hurting your vision with the glasses you are using (differentials or normalized), it helps to have a point of comparison (like a line on a snellen chart), and to compare against that reference point before and after the activity in question. | ||