Re: Viewing angle

[T3D <jeremy.hinton@xxxxxxxxx>]

 >John B wrote:
 
 >Does anyone know how human visual resolution falls off with angle from the
 > optic axis?  I wonder if it's a gentle curve or lumpy.  Jim C would know 
 >but he ain't talkin'.  8-)  If it's lumpy, it could give some credence to 
 > Canon's statement.
 
 
 To a good approximation, human visual resolution drops off as the 
 reciprocal of the angle from the optic axis. 
 (linear resolution proportional to (theta+1)^-1)
 This assumed photopic lighting conditions, where cone-mediated vision 
 dominates, and monochrome stimuli.
 
 The only major 'lump' (trough) is the blind spot, at approx 12 degrees to one 
 side (nasal retina, temporal visual field), but this is limited to one 
 direction, a small segment of the annulus around the optic axis, and for the 
 two-eyed readers of P/T3D, we have cover for that 'lump' anyway. Acuity 
 (resolution) 'contours' are slightly elliptical - acuity being a little better 
 along the horizontal meridian as compared to above or below the centre of 
 regard.
 
 Roughly.
 
 Jeremy


------------------------------

End of TECH-3D Digest 227
*************************
*************************
 Trouble? Send e-mail to 
 wier@xxxxxxxxxxxxxxxxxxxxxxxx 
 To unsubscribe select one of the following,
 place it in the BODY of a message and send it to:
 listserv@xxxxxxxxxxxxxxxxxxxxxxxx 
   unsubscribe photo-3d
   unsubscribe sell-3d
   unsubscribe overland-trails
   unsubscribe icom
 *************************