3 ms·
The maximum thickness is about 4mm -- very reasonable, given the strength of the correction. This is with a fairly small round frame (lens width 41mm). The fi
by ScottBurson 9y ago
The maximum thickness is about 4mm -- very reasonable, given the strength of the correction. This is with a fairly small round frame (lens width 41mm).
The first RGB LED monitor I ran into was an Apple Cinema Display, several years ago. I initially didn't understand why I found it so uncomfortable to use. I think all the iMacs built in the last 7 years or so are RGB, as are all the Retina MacBook Pros. -- Well, as the article you linked to explains, they might be GB-r instead (green and blue LEDs with a red phosphor). From a dispersion perspective, GB-r is just as bad as RGB; so are quantum dots and the now-obsolete wide-gamut CCFL. All of these wide-gamut technologies will have much more red-green dispersion than either the old standard CCFLs or WLED.
I wasn't aware of Freeform; I guess that's because I don't use progressives -- I just switch glasses, or slide them down my nose to adjust focus. But it seems to be a lens shaping technology, not a lens material.
- walterbell 9y agoHmm, does it apply to iPhone and iPad screens, especially with Apple’s “True Tone” display? Given the size of the iPhone user base, your blog post should be better known. edit: web search did not locate definitive statements about RGB LED in either iPhone or Macbook retina screens.
- ScottBurson 9y agoWell, I'm not certain about past models, but the current MacBook Pro advertises "Wide color (P3)", referring to the DCI P3 gamut. This obviously requires a wide-gamut backlight of some kind. I found this [0] blog post talking about DCI P3 vs. Adobe RGB. Looks like the iPhone 7 was the first iPhone with a wide gamut [1]. No idea about the iPad. [0] http://www.colourspace.xyz/the-new-apple-imac-and-the-dci-p3-colour-gamut/ http://www.colourspace.xyz/the-new-apple-imac-and-the-dci-p3... [1] https://www.reddit.com/r/apple/comments/5287c3/lets_talk_about_that_new_display_in_iphone_7/ https://www.reddit.com/r/apple/comments/5287c3/lets_talk_abo...
- jaggederest 9y agoFreeform lenses, from what I can see, are an attempt to compensate for higher-order aberration than the standard sphere, cylinder/axis, prism/base prescription