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Theater Viewing angle & distances
The horizontal viewing angle also called the field of view is the angle subtended by from each corner of the cinema screen to the center of the seating position. 
There are two main standards 
  1. SMPTE (The Society of Motion Picture and Television Engineers )  specifications 
  2. THX  (founded in 1983 by George Lucas) specifications 
Horizontal viewing angle 

THX specifications : 
THX specifications have a minimum viewing angle of 36 degrees from the last row of seats. The viewing angle ‘sweet spot’ seems to be around 45-50 degrees and back row of seats in a theater have at least a 26 degree viewing angle.  

SMPTE standard

SMPTE standard EG-18-1994 recommends a minimum viewing angle of 30 degrees for movie theaters
SMPTE specification have maximum 61.8 degree viewing angle for closest and 33.3 degree for farthest and 43.4 degree is reference of SMPTE for 2.39 : 1 image 

Vertical viewing angle 

THX specifications : 
The vertical viewing angle is measured at seated eye height from the front row center seat to the top of the tallest projected image. The THX specifications have no references to a "best" or "optimal" vertical viewing angle.  However, normal human vision's optimal cone of vision has a radius of approximately 15 degrees.  No viewer to have an angle of greater than 15 degrees to the top or bottom of the screen. Typically this puts viewers eye’s at 1/3rd to 1/6th of screen height.

SMPTE standard EG-18-1994 notes that: 

"for most viewers physical discomfort begins when this angle exceeds 35 degrees. We strongly recommend that the layout of the auditorium adheres to this engineering guideline." 
This guideline would be difficult to exceed in a home theater, with most vertical viewing angles in the 15-20 degree range. 

Vertical Viewing Field of the Eye
Vertical viewing angle at the first row preferably about 25 degrees

[Image: VerticalView.jpg]
horizontal Viewing Field of the Eye
Horizontal viewing angle at the first row preferably about 35 degrees

[Image: HorizontalView.jpg]

Taken from Readability in Classrooms by Piet van der Zanden
We cannot see an object which is farther from use than about 3500 times its size 
In general field of view has irregular conical shape , measuring about 30 degree up  , 45 degree down, 65 degree to each side. 

Maximum distance
Maximum distance for seeing people is 4000 feet
Maximum distance for discerning action is 450 feet
Maximum distance for recognizing a face is 80 feet 
Maximum distance for discerning facial expression is 40 feet 
Range of conversational distance is 3 feet to 10 feet 

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