10 
REFERENCES 
1. Bevan, W. "Perceptual Learning: an Overview," J. Gen. Psychol., 
64, 69-99, (1961). 
2. Blackwell, H. R. "Studies of Psychophysical Methods of 
Measuring Visual Thresholds," J. Optic. Soc. Am., 
42, 606-616, (Sept. 1952). 
3. Colenbrander, M. C. De Weg van het Zien. Amsterdam: Wereld 
Bibliotheek, 1957. 
4. Fender, D. H., and P. W. Nye. "An Investigation of the 
Mechanisms of Eye Movement Control," Kybemetik, 
I, 2, 81-88, (July 1961). 
5. Glezer, V. D. "The Eye as a Scanning Mechanism," Fizziol. Zh. 
S.S.S.R., 45, No. 3, 271-279, (1959). 
6. Guilford, J. P. Psychometric Methods. 2nd Ed. New York: 
McGraw HilJ., 1954. 
7. Jones, L. A., and G. C. Higgins. "Photographic Granularity 
and Graininess. III. Some Cbaj=a£fef^stics of the Visual 
System of Importance, in the Evaluation of Graininess and 
Granularity,."-J, Optic Soc. Am., 37, 4, 217-263, 
(Apr. 1947). 
8. Ludvigh, E. "Extrafoveal Visual Acuity as Measured with 
Snellen Test-Letters," Am, J. Ophthal., 24, 303-310, 
(1941). 
9. O'Brien, B. "Vision and Resolution in the Central Retina," 
J. Optic. Soc. Am,, 41, 12, 882-894, (Dec. 1951). 
10. O'Connor, D. C. The Precision of Pointing to the Images of 
Signalized Points in Photogrammetry, with particular 
Reference to the Contrast Transfer Theory. Delft: 
International Training Centre for Aerial Survey 
Publication A 14/15, October, 1961. 
11. Ogle, K. N. "Blurring of Retinal Image and Foveal Differ 
ential Light Thresholds," Am. J, Ophthal,, 52, 755/323, 
(Nov. 1961).