PMID- 1635758
OWN - NLM
STAT- MEDLINE
DCOM- 19920827
LR  - 20190907
IS  - 1040-5488 (Print)
IS  - 1040-5488 (Linking)
VI  - 69
IP  - 7
DP  - 1992 Jul
TI  - Multimeridional apparent frontoparallel plane: relation between stimulus 
      orientation angle and compensating tilt angle.
PG  - 544-9
AB  - The classical apparent frontoparallel plane (AFPP) setting is typically obtained 
      by having the subject move a series of parallel rods farther or closer until they 
      line up in a plane perceived to be parallel to the face plane. If there is a size 
      difference between the two ocular images, the AFPP setting defined by the rods 
      will exhibit a tilt from the objective frontoparallel plane, about an axis 
      parallel to the rods. The multimeridional apparent frontoparallel plane (MAFPP) 
      is an extension of this procedure to rod orientations other than the vertical 
      meridian. In previous studies, it was found that oblique tilt angle settings 
      corresponding to rod orientations of 45 degrees and 135 degrees are equal to 
      square root 2 times the tilt angle for the vertical rod orientation for the same 
      interocular magnification difference along the meridian perpendicular to the 
      rods. In this study, we measured the tilt angles produced by a series of oblique 
      rod orientations between 15 degrees and 165 degrees, inclusive. Throughout the 
      150 degrees range tested, the tilt angles were found to be consistently 
      proportional to the cosecant of the rod orientation angle, the factor square root 
      2 previously used being a specific example of this relation. Within this range, 
      neither empirical cues nor the induced effect cause the cosecant relation to 
      break down. It is suggested that the MAFPP procedure can be applied more 
      extensively than previously anticipated.
FAU - Remole, A
AU  - Remole A
AD  - School of Optometry, University of Waterloo, Ontario, Canada.
FAU - Code, S M
AU  - Code SM
FAU - Matyas, C E
AU  - Matyas CE
FAU - McLeod, M A
AU  - McLeod MA
FAU - To, C K
AU  - To CK
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Optom Vis Sci
JT  - Optometry and vision science : official publication of the American Academy of 
      Optometry
JID - 8904931
SB  - IM
MH  - Aniseikonia/physiopathology
MH  - Fixation, Ocular
MH  - Form Perception/*physiology
MH  - Humans
MH  - Posture
EDAT- 1992/07/01 00:00
MHDA- 1992/07/01 00:01
CRDT- 1992/07/01 00:00
PHST- 1992/07/01 00:00 [pubmed]
PHST- 1992/07/01 00:01 [medline]
PHST- 1992/07/01 00:00 [entrez]
AID - 10.1097/00006324-199207000-00006 [doi]
PST - ppublish
SO  - Optom Vis Sci. 1992 Jul;69(7):544-9. doi: 10.1097/00006324-199207000-00006.