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Estimation of the Position of the Center of the Fovea Relative to Fixation in Normal Subjects and in Patients With Amblyopia: Use of the Visually Evoked Potential

Estimation of the Position of the Center of the Fovea Relative to Fixation in Normal Subjects and... Abstract • A new method to measure eccentric fixation based on differences in the waveforms of visually evoked potentials to stimuli presented to different parts of the visual field was studied in ten normal and 13 amblyopic subjects. In all of the 20 normal eyes, fixation corresponded to the horizontal position of the center of the fovea within the resolution of the method, approximately 30 minutes of arc. In seven of the 13 amblyopic eyes, fixation did not correspond to the horizontal position of the center of the fovea. Only one of these amblyopic eyes was found to have eccentric fixation by visuscopy. The vertical position of fixation relative to the center of the fovea was not well defined by the method in either the normal or the amblyopic eyes. References 1. Goldschmidt M: A new test for the function of the macula lutea . Arch Ophthalmol 1950; 44:129-135.Crossref 2. Stanworth A, Naylor EJ: The measurement and clinical significance of the Haidinger effect . Trans Ophthalmol Soc UK 1955;75:67-79. 3. Flom MC, Weymouth FW: Centricity of Maxwell's spot in strabismus and amblyopia . Arch Ophthalmol 1961;66:260-268.Crossref 4. Von Noorden GK: Pathogenesis of eccentric fixation . Doc Ophthalmol 1967;23:263-294.Crossref 5. Hess RF: On the relationship between strabismic amblyopia and eccentric fixation . Br J Ophthalmol 1977;61:767-773.Crossref 6. Lawwill T: Fixation pattern of the light and dark adapted amblyopic eye . Am J Ophthalmol 1966;61:1416-1419. 7. Halliday AM, Michael WF: Changes in pattern-evoked responses in man associated with the vertical and horizontal meridians of the visual field . J Physiol 1970;208:499-513. 8. Jeffreys DA: Cortical source locations of pattern-related visual-evoked potentials recorded from the human scalp . Nature 1971;229:%502-504.Crossref 9. Lehman D, Meles HP, Mir Z: Average multichannel EEG potential fields evoked from upper and lower hemi-retina: Latency differences . Electroencephalogr Clin Neurophysiol 1977;43:%725-731.Crossref 10. Jeffreys DA, Smith AT: The polarity inversion of scalp potentials evoked by upper and lower half-field stimulus patterns: Latency or surface distribution differences? Electroencephalogr Clin Neurophysiol 1979;46:409-415.Crossref 11. Leservre N, Joseph JP: Modifications of the pattern-evoked potential (PEP) in relation to the stimulated part of the visual field (clues for the most probable origin of each component) . Electroencephalogr Clin Neurophysiol 1979;47:183-203.Crossref 12. Darcey TM, Fenda DH: Spatio-temporal visually evoked scalp potentials in response to partial-field patterned stimulation . Electroencephalogr Clin Neurophysiol 1980;50:348-355.Crossref 13. Yarbus AL: Eye Movements and Vision . New York, Plenum Publishing Corp, 1967, pp 107-108. 14. Michael WF, Halliday AM: Differences between the occipital distribution of upper and lower field pattern-evoked responses in man . Brain Res 1971;32:311-324.Crossref http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

Estimation of the Position of the Center of the Fovea Relative to Fixation in Normal Subjects and in Patients With Amblyopia: Use of the Visually Evoked Potential

Archives of Ophthalmology , Volume 100 (12) – Dec 1, 1982

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Publisher
American Medical Association
Copyright
Copyright © 1982 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1982.01030040903007
Publisher site
See Article on Publisher Site

Abstract

Abstract • A new method to measure eccentric fixation based on differences in the waveforms of visually evoked potentials to stimuli presented to different parts of the visual field was studied in ten normal and 13 amblyopic subjects. In all of the 20 normal eyes, fixation corresponded to the horizontal position of the center of the fovea within the resolution of the method, approximately 30 minutes of arc. In seven of the 13 amblyopic eyes, fixation did not correspond to the horizontal position of the center of the fovea. Only one of these amblyopic eyes was found to have eccentric fixation by visuscopy. The vertical position of fixation relative to the center of the fovea was not well defined by the method in either the normal or the amblyopic eyes. References 1. Goldschmidt M: A new test for the function of the macula lutea . Arch Ophthalmol 1950; 44:129-135.Crossref 2. Stanworth A, Naylor EJ: The measurement and clinical significance of the Haidinger effect . Trans Ophthalmol Soc UK 1955;75:67-79. 3. Flom MC, Weymouth FW: Centricity of Maxwell's spot in strabismus and amblyopia . Arch Ophthalmol 1961;66:260-268.Crossref 4. Von Noorden GK: Pathogenesis of eccentric fixation . Doc Ophthalmol 1967;23:263-294.Crossref 5. Hess RF: On the relationship between strabismic amblyopia and eccentric fixation . Br J Ophthalmol 1977;61:767-773.Crossref 6. Lawwill T: Fixation pattern of the light and dark adapted amblyopic eye . Am J Ophthalmol 1966;61:1416-1419. 7. Halliday AM, Michael WF: Changes in pattern-evoked responses in man associated with the vertical and horizontal meridians of the visual field . J Physiol 1970;208:499-513. 8. Jeffreys DA: Cortical source locations of pattern-related visual-evoked potentials recorded from the human scalp . Nature 1971;229:%502-504.Crossref 9. Lehman D, Meles HP, Mir Z: Average multichannel EEG potential fields evoked from upper and lower hemi-retina: Latency differences . Electroencephalogr Clin Neurophysiol 1977;43:%725-731.Crossref 10. Jeffreys DA, Smith AT: The polarity inversion of scalp potentials evoked by upper and lower half-field stimulus patterns: Latency or surface distribution differences? Electroencephalogr Clin Neurophysiol 1979;46:409-415.Crossref 11. Leservre N, Joseph JP: Modifications of the pattern-evoked potential (PEP) in relation to the stimulated part of the visual field (clues for the most probable origin of each component) . Electroencephalogr Clin Neurophysiol 1979;47:183-203.Crossref 12. Darcey TM, Fenda DH: Spatio-temporal visually evoked scalp potentials in response to partial-field patterned stimulation . Electroencephalogr Clin Neurophysiol 1980;50:348-355.Crossref 13. Yarbus AL: Eye Movements and Vision . New York, Plenum Publishing Corp, 1967, pp 107-108. 14. Michael WF, Halliday AM: Differences between the occipital distribution of upper and lower field pattern-evoked responses in man . Brain Res 1971;32:311-324.Crossref

Journal

Archives of OphthalmologyAmerican Medical Association

Published: Dec 1, 1982

References