The Basis of a Method of Perimetry with Monkeys

The value of perimetry as a means of studying the visual system is stressed. Perimetry has never been done with animals because it is difficult to record and control their fixation. Existing methods of determining eye position cannot readily be used with monkeys, chiefly because the subject's head must be prevented from moving more than fractions of a millimetre. Other limitations are mentioned. A new method of determining fixation is described. Although not nearly as precise as other methods it is unaffected by head movements as great as 1/2 in.; it is straightforward to restrict a monkey's head movements to this amount. The eye position is found from the relative positions of four corneal reflections and the borders of the iris. These relative positions change very much more after an eye rotation than they do after a head movement in which fixation has been maintained.

[1]  A. Churchill.  The Physiology of the Eye , 1949, The British journal of ophthalmology.

[2]  Paul G. Roofe,et al.  The Vertebrate Visual System , 1958, Neurology.

[3]  K N OGLE,et al.  On the precise objective determination of eye movements. , 1956, A.M.A. archives of ophthalmology.

[4]  W. R. Miles.  The Steady Polarity Potential of the Human Eye. , 1939, Proceedings of the National Academy of Sciences of the United States of America.

[5]  W R Miles.  The Steady Potential of the Human Eye in Subjects with Unilateral Enucleation. , 1939, Proceedings of the National Academy of Sciences of the United States of America.

[6]  R. Dodge,et al.  Practical directions for stimulating and for photographically recording eye-movements of animals. , 1938 .

[7]  M. Alpern.  The position of the eyes during prism vergence. , 1957, A.M.A. archives of ophthalmology.

[8]  M. Vernon,et al.  METHODS OF RECORDING EYE MOVEMENTS , 1928, The British journal of ophthalmology.

[9]  W R Miles,et al.  Reliability of Measurements of the Steady Polarity Potential of the Eye. , 1939, Proceedings of the National Academy of Sciences of the United States of America.

[10]  CHRISTINE KRIS,et al.  Corneo-Fundal Potential Variations during Light and Dark Adaptation , 1958, Nature.

[11]  K N OGLE,et al.  Fixation disparity. , 1954, The American orthoptic journal.

[12]  C. Rashbass.  New method for recording eye movements. , 1960, Journal of the Optical Society of America.

[13]  W. Andrew.  The vertebrate visual system , 1957 .

[14]  R. W. Ditchburn,et al.  Involuntary eye movements during fixation , 1953, The Journal of physiology.

[15]  M. Tinker,et al.  The study of eye movements in reading. , 1946, Psychological bulletin.

[16]  Ward C. Halstead.  A Method for the Quantitative Recording of Eye Movements , 1938 .

[17]  N. Miller,et al.  THE CORNEO-RETINAL POTENTIAL DIFFERENCE AS THE BASIS OF THE GALVANOMETRIC METHOD OF RECORDING EYE MOVEMENTS , 1935 .

[18]  E. L. Stromberg.  The reliability of monocular photography in the investigation of reading. , 1942 .

[19]  J. B. Hursh,et al.  MOVEMENTS OF THE EYES WHEN THE LIDS ARE CLOSED , 1936 .

[20]  L. Carmichael,et al.  A quantitative comparison of the electrical and photographic techniques of eye-movement recording , 1939 .

[21]  R. Dodge,et al.  The angular velocity of eye movements , 1901 .

[22]  Ellerbrock Vj,et al.  Inducement of cyclofusional movements. , 1954 .

[23]  G. Westheimer,et al.  Disjunctive eye movements , 1961, The Journal of physiology.

[24]  H. B. Barlow,et al.  Slippage of Contact Lenses and other Artefacts in Relation to Fading and Regeneration of Supposedly Stable Retinal Images , 1963 .

[25]  H. Hartridge,et al.  METHODS OF INVESTIGATING EYE MOVEMENTS , 1948, The British journal of ophthalmology.

[26]  R. Dodge.  An experimental study of visual fixation , 1907 .

[27]  M. P. Lord.  Measurement of Binocular Eye Movements of Subjects in the Sitting Position * , 1951, The British journal of ophthalmology.

[28]  Myron Yanoff,et al.  Textbook of Ophthalmology , 1938, The Indian Medical Gazette.