Use of scrolled text in a scanning laser ophthalmoscope to assess reading performance at different retinal locations *

A new technique is described for assessing reading performance using a scanning laser Ophthalmoscope. Letters of different sizes and contrasts were projected onto specific retinal locations of normal and low vision observers. Successive letters were scrolled in a horizontal direction at different speeds through a ‘window’. Throughout the experiments the subjects' fundus and the retinal location of the stimuli could be visualized. With this scanning laser ophthalmoscope text‐scrolling computer program the subject does not search for adjacent letters, and because the eye is held relatively stationary the tedious eye movement analysis incurred in other studies is reduced. Five retinal areas were investigated in two normal observers. The percentage of letters correctly identified decreased with eccentricity, increased velocity of the text and reduced text contrast. The reading performance of two patients, one with age‐related macular degeneration and the other with juvenile macular disease, was investigated. Decrements in performance were related to morphology of the lesions.

[1]  A. Hendrickson,et al.  Human photoreceptor topography , 1990, The Journal of comparative neurology.

[2]  R W Massof,et al.  Peripheral retinal function in age-related macular degeneration. , 1985, Archives of ophthalmology.

[3]  Jc Joop Jacobs,et al.  The effect of contrast on letter and word recognition , 1981 .

[4]  M Lades,et al.  Measurement of eye rotations in three dimensions and the retinal stimulus projection using scanning laser ophthalmoscopy , 1990, Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians.

[5]  C L Trempe,et al.  Retinal localization of scotomata by scanning laser ophthalmoscopy. , 1982, Investigative ophthalmology & visual science.

[6]  G. Legge,et al.  Psychophysics of reading—I. Normal vision , 1985, Vision Research.

[7]  Maynard C. Wheeler,et al.  VISUAL ACUITY WITHIN THE AREA CENTRALIS AND ITS RELATION TO EYE MOVEMENTS AND FIXATION , 1928 .

[8]  C. Curcio,et al.  Topography of ganglion cells in human retina , 1990, The Journal of comparative neurology.

[9]  J. Lovie-Kitchin.  High contrast and low contrast visual acuity in age related macular degeneration * , 1989 .

[10]  Maynard C. Wheeler,et al.  Visual Acuity within the Area Centralis and its Relation to Eye Movements and Fixation , 1928 .

[11]  T. Hirose,et al.  Recording pattern reversal visual evoked response with the scanning laser ophthalmoscope , 1989, Acta ophthalmologica.

[12]  A J Adams,et al.  Evidence for a neural basis of age-related visual field loss in normal observers. , 1989, Investigative ophthalmology & visual science.

[13]  London,et al.  Treatment of senile disciform macular degeneration: a single-blind randomised trial by argon laser photocoagulation. The Moorfields Macular Study Group. , 1982, The British journal of ophthalmology.

[14]  M Intaglietta,et al.  Confocal laser tomographic analysis of the retina in eyes with macular hole formation and other focal macular diseases. , 1989, American journal of ophthalmology.

[15]  D. Van Norren,et al.  Imaging retinal densitometry with a confocal scanning laser ophthalmoscope , 1989, Vision Research.

[16]  W H Woon,et al.  The Scanning Laser Ophthalmoscope: Basic Principles and Applications , 1990 .

[17]  C. McGrath,et al.  The effects of age on spatial frequency perception in human subjects. , 1981, Quarterly journal of experimental physiology.

[18]  J. Rovamo,et al.  Temporal contrast sensitivity and cortical magnification , 1982, Vision Research.

[20]  J. Lovie-Kitchin,et al.  Contrast sensitivity in central and paracentral retina in age related maculopathy , 1987 .

[21]  Andreas Plesch,et al.  Optical Characteristics Of A Scanning Laser Ophthalmoscope , 1989, Optics & Photonics.

[22]  K. Rayner,et al.  Asymmetry of the effective visual field in reading , 1980, Perception & psychophysics.

[23]  Michel Millodot,et al.  Peripheral visual acuity in the vertical plane , 1974 .

[24]  E Peli,et al.  Reading with a macular scotoma. II. Retinal locus for scanning text. , 1987, Investigative ophthalmology & visual science.

[25]  Henrik Sjögren,et al.  ZUR KENNTNIS DER KERATOCONJUNCTIVITIS SICCA II , 1935 .

[26]  L. Arend,et al.  Reading with a macular scotoma. I. Retinal location of scotoma and fixation area. , 1986, Investigative ophthalmology & visual science.

[27]  R. Webb,et al.  Flying spot TV ophthalmoscope. , 1980, Applied optics.

[28]  M. P. Rubinstein,et al.  The crowding phenomenon and its significance in senile macular degeneration , 1985 .

[29]  J Cerella,et al.  Age-related decline in extrafoveal letter perception. , 1985, Journal of gerontology.

[30]  A. Bird.  Treatment of senile disciform macular degeneration. , 1977, Transactions of the Ophthalmological Society of New Zealand.

[31]  R. Weale,et al.  A BIOGRAPHY OF THE EYE , 1983 .

[32]  J. Marshall,et al.  The ageing retina: Physiology or pathology , 1987, Eye.

[33]  G. J. van der Wildt,et al.  Contrast sensitivity as a function of position on the retina , 1980, Vision Research.

[34]  Gordon E. Legge,et al.  Psychophysics of reading—II. Low vision , 1985, Vision Research.

[35]  B. Straatsma,et al.  Peripheral retinal function in age-related macular degeneration. , 1985, Archives of ophthalmology.

[36]  D. Madden,et al.  Adult Age Differences in Visual Acuity, Stereopsis, and Contrast Sensitivity , 1987, American journal of optometry and physiological optics.