Page 29 - BOAF Journal 1 2012:2707

Behavioral Optometry
BOAF
Volume1 Number1 2012
Figure No.13 illustrates a further advancement of typical changes in the centrocaecal visual fields associated with glaucoma. The right eye represents an early Bjerrum‘s sign.
Variations in Findings
The reason for a different technique or direction of moving the test object for focal infection charting and pathological sco- tomata charting is to make the signs of each more obvious. A charting taken in both directions (caecanometrically from the seeing to the non-seeing and for pathology from the non- seeing to the seeing) should be done on each patient as the comparison between the two is of clinical value. Further, when pathology is suspected, the 1.00 m/m test object which is used for the pathology charting might not be definitive enough and further evidence may be obtained by then using the 0.79 m/m and/or the 0.50 m/m test objects.
The following illustrations with explanations are a few of the many variations which may be found in combinations when charting from seeing to non- seeing and non-seeing to see- ing on a patient:
The illustrations are „text- book“ in nature and you can
expect to find multiple varia- tions and /or shadings of differ- ence from these.
Fig.14
Figure No.14 is an illustration of a normal patient with no signifi- cant focal infection or pathology who is healthy and responsive. The plotted physiological blind- spot by the Davidsen technique of seeing to non-seeing will be within normal limits or 5% re- stricted and only no more than one-half to three millimeters larger when taken by the tech- nique of non-seeing to seeing for pathology with the 1.0 m/m test object and LO illumination.
Fig.15
Figure No.15 illustrates a moder- ate focal infection with no patho- logical enlargement.
Fig.16
Figure No.16 shows a focal infec- tion case with moderate to se- vere focal infection and no visual system pathology. This patient will show restrictions of 5 to 95% when taken from seeing to the non-seeing and no excess en- largement when taken from the non-seeing to seeing.
Fig.17
Figure No.17 illustrates the pa- thology case which shows no restriction of the plotted blind- spot by the Davidsen method but shows an enlargement taken from the non-seeing to the see- ing with the 1.0 m/m or smaller test object under LO illumination.
Fig.18
Figure No.18 is a plotting of a moderate focal infection case with pathological changes due to chronic insidious wide-angle glaucoma. it shows a restriction by the Davidsen technique of 8 to 25%. At the same time, a pa- thology charting taken from within the physiological blind- spot out with 1.0 m/m test object and LO illumination shows an enlargement.
Fig.19
Figure No.19 illustrates a patient with a considerable focal infec- tion as determined by a much greater restriction of 82 to 93% and the pathology charting will measure a vastly enlarged blind- spot.
Fig.20
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