General > General Technical Chat
QUESTION ABOUT EYE SACCADES: With 5 Usec. Light pulses
(1/1)
RJSV:
QUESTION:
   Why is the eyeball movement saccades causing view of very fast light pulses, at 5 Usec period, which is about 200 to 300 khz rate ?
   Expected perhaps 20 mSec for one of those 'fast' eye scans...that's not what I see as maybe 5 pulses, in 20 mSec is going to be on order of 4 mSec each.  Scope showing 5 MICRO-Sec. pulses.
  ???
floobydust:
What brightness? I thought the rods/cones are basically integrators responding to the intensity-time product. The eye does have a huge dynamic range.
Saccades do not affect this, as far as I know. I can see LED car tailights strobing/flickering doing a visual sweep that normally appear to be lit steady.
But 5usec seems wrong, simply way too fast for our physiology - unless you are in a dark room with very bright LED but I've never tried that kind of speed.
The only time I've been into saccades is making emdr machines.
RJSV:
Yes you are correct; the periodic 'pearls' that happen with modulated light and head or eye motion, that's in millisecond range, not much below 20 mSec to sweep eyesight across that single modulated LED.  So that's one thousand times slower than having a few images traced out on retina at 230 khz (4.8 Usec periods).
Navigation
Message Index
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod