Varikuti PhD thesis final.pdf - Anglia Ruskin Research Online

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Figure 4.5: Recognition thresholds are plotted as a function of separation inletter widths for each amblyopic subject. Each datum represents the highcontrast recognition threshold for each separation condition. The datum pointsin blue and red represents the thresholds for the non-amblyopic eyes andamblyopic eyes respectively. The error bars represents ±1 standard deviation(SD).165
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ANGLIA RUSKIN UNIVERSITYFURTHER INS
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ANGLIA RUSKIN UNIVERSITYABSTRACTFAC
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TABLE OF CONTENTSACKNOWLEDGEMENTS .
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...................................
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Table 4.5(A) and 4.5(B): Depicts th
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Tables 5.8(A) and 5.8(B): Depicts t
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Chapter 1General IntroductionVision
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Visual acuity chartsSnellen chartTh
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Bailey-Lovie LogMAR chartThe LogMAR
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An accurate and repeatable measurem
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elimination of one or more of these
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1985; 1988). Greater crowding in yo
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In order to study the reliability o
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A significant difference in visual
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has gained increased attention foll
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Figure 1.3: Depicts the picture of
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Landolt C surrounded by flanking ba
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Figure 1.4: Depicts the picture of
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normal vision and at the fovea and
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educed at the abutting condition wh
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Figure 1.5: Depicts the data obtain
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fixations in normal eyes. Further,
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Figure 1.6: Example of a Regan repe
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and adults had better isolated lett
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(Glasgow acuity poorer than the iso
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closer separations based on the fin
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identify. On the other hand a 10 mi
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Figure 1.7: Example of a PVA test c
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the inner letters resulting in miss
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gaze instability in amblyopes. A se
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each letter in the low contrast Sne
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1999a), the findings are contradict
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RationaleTo determine the effect of
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In most of the studies (Stuart and
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study the effect of contour interac
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contour interaction effect and not
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contour interaction as the Snellen
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In this experiment, the effect of l
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The final set of experiment will in
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Chapter 2The effect of contour inte
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laterality (unlike the Illiterate E
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ProcedureGeneral conditionSix adult
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Figure 2.2: Schematic showing examp
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Figure 2.3: Schematic of the SGRL s
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were corrected by adjusting the deg
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Figure 2.4: The data shown in the f
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thresholds normalised against the i
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Table 2.1: (A) Depicts high contras
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IH was replaced by his slope value
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Table 2.2: Depicts slopes obtained
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Figure 2.7: The data shown are a la
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Table 2.3: (A) Depicts recognition
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Figure 2.9:93
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Figure 2.1196
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Figure 2.13:99
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error bars represent ± 1 SD.101
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The effect of the relative letter l
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Figure 2.15: The graph shows mean l
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Normalised recognition thresholds (
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DiscussionThe main results of this
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Since the experiment of Flom, Weymo
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showed that the target flanker simi
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Page 130 and 131: Chapter 3The effect of contour inte
Page 132 and 133: MethodsMethod of generating low con
Page 134 and 135: the low contrast letters were more
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Page 138 and 139: isolated letter in each slide was l
Page 140 and 141: the identification of the isolated
Page 142 and 143: Threshold of psychometric functions
Page 144 and 145: The threshold values obtained from
Page 146 and 147: AB133
Page 148 and 149: Figure 3.4: Depicts normalised thre
Page 150 and 151: Slopes of psychometric functionsThe
Page 152 and 153: Figure 3.5: Average slope of the ps
Page 154 and 155: esulting in improved threshold visu
Page 156 and 157: employed the same size target for t
Page 158 and 159: Chapter 4The effect of contour inte
Page 160 and 161: Freeman, 1981). As a result of the
Page 162 and 163: Table 4.1: Depicts the visual featu
Page 164 and 165: same as that of the main experiment
Page 166 and 167: Figure 4.2: The recognition thresho
Page 168 and 169: Table 4.2: Depicts the test distanc
Page 170 and 171: Figure 4.3: The percentage correct
Page 172 and 173: 2 X contrastSubject Eye Contrast th
Page 174 and 175: A (amblyopic eyes) B (non-amblyopic
Page 176 and 177: Table 4.4(A) and 4.4(B): Depicts th
Page 180 and 181: Figure 4.6(A) shows mean recognitio
Page 182 and 183: Figure 4.6: (A) Recognition thresho
Page 186 and 187: Figure 4.7: Depicts normalised thre
Page 188 and 189: Further, the estimates of slopes ob
Page 192 and 193: Low contrast conditionFor all the f
Page 194 and 195: A (non-amblyopic eyes) B (amblyopic
Page 198 and 199: Figure 4.10: Depicts the layout of
Page 200 and 201: Figure 4.11(A) shows mean absolute
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Page 204 and 205: The threshold values of all the sep
Page 206 and 207: Figure 4.12: Depicts normalised thr
Page 208 and 209: Further, the estimates of slopes fo
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Page 212 and 213: High and low contrast conditionThe
Page 214 and 215: DiscussionThe current experiment in
Page 216 and 217: ecognition thresholds were nearly t
Page 218 and 219: on the target size and the extent o
Page 220 and 221: the contrast sensitivity loss was d
Page 222 and 223: Simmers, Gray, McGraw and Winn, 199
Page 224 and 225: separations are also immune to the
Page 226 and 227: SGCI chart was surrounded by an add
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ProcedureGeneral conditionThree adu
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Chapters 2 and 4 where the effect o
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ResultsGeneral conditionFor the 3 n
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The effects of crowding on visual a
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Figure 5.4(A): The top panel depict
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Further, the estimates of slopes ob
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Table 5.4(A) and (B): Depicts the s
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and mean complex interaction thresh
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235
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A (non-amblyopic eyes) B (amblyopic
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Figure 5.8: The difference between
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Std error 0.05 0.06 0.06 0.07 0.07
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For the amblyopic subjects, a three
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Control conditionError analysisData
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249
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DiscussionThe current experiment in
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Based on these findings, we attribu
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and Spowart, 1997), multiple E opto
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Chapter 6Summary and conclusionsThe
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The effect of contour interaction o
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demonstrable at the abutting condit
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SGCI thresholds when measured for s
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REFERENCESABRAHAMSSON, M. and SJOST
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BERNARD, J.B. and CHUNG, S.T.L., 20
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ELLIOTT, D., BULLIMORE, M., PATLA.
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HARIHARAN, S., LEVI, D.M. and KLEIN
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JACOBS, R.J., 1979. Visual resoluti
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LEVI, D.M., KLEIN, S.A. and HARIHAR
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OWSLEY, C., 1994. Vision and drivin
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ROBINSON, D.A., 1964. The mechanics
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SIMMERS, A.J., GRAY, L.S. and WINN,
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AppendicesAppendix 1: Depicts the p
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three and two amblyopic subjects re
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Appendix 3:287
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Appendix 4: The percentage of subst
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Appendix 5: Depicts the letter conf
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