Retinal Location of the Preferred Retinal Locus Relative to the Fovea in Scanning Laser Ophthalmoscope Images

Timberlake, George T.; Sharma, Manoj Kumar; Grose, Susan A.; Gobert, Denise; Gauch, John M.; Maino, Joseph H.

doi:10.1097/01.opx.0000156311.49058.c8

Cited by 142 publications

(134 citation statements)

References 9 publications

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“…Identifying foveal location in SLO images of retinas with macular degeneration is usually impossible [6]. Consequently, we estimated foveal location by measuring where subjects without vision loss placed the fixation stimulus relative to their optic disks.…”

Section: Foveal Locationmentioning

confidence: 99%

Retinal locus for scanning text

Timberlake¹,

Sharma²,

Grose³

et al. 2006

JRRD

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Abstract-A method of mapping the retinal location of text during reading is described in which text position is plotted cumulatively on scanning laser ophthalmoscope retinal images. Retinal locations that contain text most often are the brightest in the cumulative plot, and locations that contain text least often are the darkest. In this way, the retinal area that most often contains text is determined. Text maps were plotted for eight control subjects without vision loss and eight subjects with central scotomas from macular degeneration. Control subjects' text maps showed that the fovea contained text most often. Text maps of five of the subjects with scotomas showed that they used the same peripheral retinal area to scan text and fixate. Text maps of the other three subjects with scotomas showed that they used separate areas to scan text and fixate. Retinal text maps may help evaluate rehabilitative strategies for training individuals with central scotomas to use a particular retinal area to scan text.

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Section: Foveal Locationmentioning

confidence: 99%

Retinal locus for scanning text

Timberlake¹,

Sharma²,

Grose³

et al. 2006

JRRD

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“…Various methods have been applied by other investigators to compute the coincidence between the gaze points of multiple subjects [10,[23][24][25][26][27]. To quantify the spatial coincidence of the gaze points of all the subjects with valid eye samples, we calculated the area of the best-fit bivariate contour ellipse (BVCEA) [28,29], BVCEA has been used in the past to quantify fixation eye movement stability [2,29] …”

Section: B Merging Of Eye Recordings Of Multiple Subjects' Records Tmentioning

confidence: 99%

Where people look when watching movies: Do all viewers look at the same place?

Goldstein

Woods

Peli

2007

Computers in Biology and Medicine

116

106

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Magnification around the most important point of a movie scene (center of interest -COI) might aid people with visual impairments that cause resolution loss. This will be effective only if most people look at the same place when watching a movie. We recorded the eye movements of 20 normallysighted subjects as each watched 6 movie clips, totaling 37.5 minutes. More than half of the time the distribution of subject gaze points fell within an area statistic that was less than 12% of the movie scene. Male and older subjects were more likely to look in the same place than female and younger subjects, respectively. We conclude that the between-subject agreement is sufficient to make the approach practical.

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“…For both scotoma and control subjects, the fPRL (or foveal fixation) bivariate ellipse area and fPRL eccentricity were calculated as described previously. 11 Potential subjects were excluded from participation if they took medications that could affect arm or hand movements, if they had neuromuscular disorders that affected arm or hand movement, or if they failed to pass the Folstein Mini Mental test. All subjects provided written informed consent by means of a consent form approved by the Kansas City Veterans Administration Medical Center Internal Review Board.…”

Section: Methods Subjectsmentioning

confidence: 99%

Preferred Retinal Locus—Hand Coordination in a Maze-Tracing Task

Timberlake

Omoscharka

Grose

et al. 2012

Invest. Ophthalmol. Vis. Sci.

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PURPOSE. Fine manual tasks require coordination of vision, eye movements, and motor control. Macular scotomas from agerelated macular degeneration (AMD) may adversely affect this coordination. The purpose of this research was to find whether the preferred retina locus for fixation (fPRL) also guided the hand in performing fine manual tasks and how the fingers, fPRL, and scotomas interacted in task performance.METHODS. Subjects with bilateral macular scotomas from AMD and normally sighted controls traced an irregular ''maze'' line pattern with the index finger while viewing their hand and the maze in a scanning laser ophthalmoscope (SLO). Video images from the SLO showing the fingers and maze on the retina during the task were analyzed to produce retinal maps showing the scotoma and bivariate ellipses of fPRL and fingertip retinal positions.RESULTS. Fingertip retinal ellipses surrounded and were approximately centered on the fPRL ellipses. Fingertip retinal bivariate area was positively correlated with fPRL bivariate area and the percent time the fPRL was on the maze was correlated with visual acuity. Maze-tracing accuracy was positively correlated with saccade rate for scotoma subjects.CONCLUSIONS. Concentric overlap of fPRL and fingertip retinal ellipses indicates that it is the fPRL that guides the hand in the maze-tracing visuomotor task, just as the fovea guides the fingertip for visually normal subjects. It is likely that factors other than fPRL and scotoma characteristics contribute to poorer maze-tracing performance by scotoma subjects in comparison with controls. (Invest Ophthalmol Vis Sci.

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Retinal Location of the Preferred Retinal Locus Relative to the Fovea in Scanning Laser Ophthalmoscope Images

Abstract: PRL position relative to the fovea can be reliably estimated by plotting the normal foveal fixation bivariate ellipse on undistorted SLO images of retinas in which the fovea is obscured as a result of the disease process.

Cited by 142 publications

References 9 publications

Retinal locus for scanning text

Retinal locus for scanning text

Where people look when watching movies: Do all viewers look at the same place?

Preferred Retinal Locus—Hand Coordination in a Maze-Tracing Task

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