PPRuNe Forums - View Single Post - VISION THREAD (other than colour vision)
View Single Post
Old 3rd Feb 2006, 03:27
  #45 (permalink)  
Loose rivets
Psychophysiological entity
 
Join Date: Jun 2001
Location: Tweet Rob_Benham Famous author. Well, slightly famous.
Age: 84
Posts: 3,270
Received 37 Likes on 18 Posts
I was giving an example of one particular angle, say 080, and the image that you might see with slight to moderate astigmatism.

I picked the colour red because there is a higher probability that this light will be problematic, or for the purpose of testing, demonstrate a defect more dramatically with an everyday object. An LED number is made up of 7 segments, three of which are horizontal and four vertical...or near enough.

A single point of light may show an almost complete secondary image, offset to a constant angle. The colour of the light may well affect the degree to which you see this error but the angle will stay the same.
Loose rivets is offline