Amblyopia: A Multidisciplinary Approach, 1e by Merrick Moseley BSc PhD, Alistair Fielder MD

By Merrick Moseley BSc PhD, Alistair Fielder MD

This booklet offers a precis and synthesis of present matters and learn in the box of 1 of the main hard paediatric eye stipulations - Amblyopia.

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A B 100 90 ! I 100 -q ! I \ \ 80 70 a. ()~ °1 ! I ~\6 ! ; 90 80 70 60 Chris. R. 10 30 20 PATHANGLE(deg) 0 90 0-- 80 70 0 '0 60 50 40 E 0 10 20 PATHANGLE (deg) 30 F 100 100 0- ! ; -a.... T. 50 0 20 -Q. 90 ,, Q. B. 0 10 20 30 PATH ANGLE (degrees) One possibility is that the deficient positional coding, which has been discussed above, could underlie the reduced performance on this task. 17 shows that if positional noise is added to the elements of the contour then normal and amblyopic performance can be equated, suggesting a role for the positional deficit in explaining the reduced performance of amblyopes on this task.

By plotting the maximum field power as a function of stimulus periodicity. we derived a measure of the spatial frequency response properties of the activated cortical area. 7 shows the results for six amblyopes. The tuning functions for the normal (closed symbols) and amblyopic eyes (open symbols) of each subject were bandpass. peaking at 1-2 c/deg with a cut-off near 4 c/deg. Note that the 5 8 JD 4 KC -'-n:6/6 -<>_. 1 b... 5 -'-n:6/5 --o-'a:6/12 3 a. 5) for both normal- (solid circles) and amblyopia-eye (open circles) viewing plotted as a function of stimulus periodicity for six observers.

A.... T. 50 0 20 -Q. 90 ,, Q. B. 0 10 20 30 PATH ANGLE (degrees) One possibility is that the deficient positional coding, which has been discussed above, could underlie the reduced performance on this task. 17 shows that if positional noise is added to the elements of the contour then normal and amblyopic performance can be equated, suggesting a role for the positional deficit in explaining the reduced performance of amblyopes on this task. , 1997). B 100 100 90 90 I I I I 80 70 60 80 70 60 50 50 0 5 10 15 20 5 0 ORIENTATION SIGMA(

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