Purchase this article with an account.
Y. Matsumoto, K. Oda, M. Yuzawa; Fixation points observed in reading different sizes of vertical and horizontal Japanese texts by patients with bilateral macular atrophy . Invest. Ophthalmol. Vis. Sci. 2004;45(13):5442.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
Purpose: To ascertain the retinal area used by patients with bilateral macular atrophy to read sentences of different character size written vertically and horizontally, using a scanning laser ophthalmoscope (SLO). Methods:34 eyes of 17 patients with bilateral macular atrophy were examined. Sentences of a fixed length (MNREAD–J ) arranged in vertical and horizontal lines were projected onto the patients’ retinas using SLO and the size of the letters was changed . Patients were asked to read the sentences aloud and both their voices and retinal images were recorded simultaneously on videotapes so that we could locate the retinal area they were using for reading. We investigated whether the fixation point on the retina for oral reading (R fixation point) and that determined by microperimetry (M fixation point) matched or not, and the relation between the scotoma and the fixation point was determined. Results: In 20 of the 34 eyes, the R and M fixation points matched regardless of the size of the characters and whether they were arranged in vertical or horizontal lines. Multiple R fixation points were recognized in 11 eyes; in 10 eyes the R fixation point was different for vertical and horizontal lines; and in 6 eyes the R fixation point for character size differed (including duplications). In 3 eyes it was impossible to determine the fixation point for oral reading. The R fixation points in most eyes were located inside the macular atrophy . In reading horizontal lines, the R fixation point was frequently positioned above the lesion . In contrast, in reading vertical lines, the R fixation point was frequently in the area nasal or temporal to the lesion. There were only a few R fixation points positioned in the lower part of the lesion .Reading vertical sentences nasal or temporal to the lesion, and reading horizontal sentences above or below the lesion, were thought to be logical in the case of patients who were unable to read in the lesion: there were many such cases. Where results did not follow this pattern, we thought that there was some unknown reason for this or the patients did not understand the position of the PRL and they had become accustomed to using a worse fixation point. Conclusions: There were multiple fixation points in eyes with bilateral macular atrophy. It was found that the R fixation point was most frequently positioned in the lesion. In case of fixation points outside of the lesion, the R fixation point was commonly above the lesion when reading horizontal lines, and in the areas nasal or temporal to the lesion when reading vertical lines.
This PDF is available to Subscribers Only