June 2017
Volume 17, Issue 7
Open Access
OSA Fall Vision Meeting Abstract  |   June 2017
Fixational eye movements in a visual acuity task
Journal of Vision June 2017, Vol.17, 13. doi:10.1167/17.7.13
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      Nancy J. Coletta, Lenna E. Walker, Fuensanta A. Vera-Diaz; Fixational eye movements in a visual acuity task. Journal of Vision 2017;17(7):13. doi: 10.1167/17.7.13.

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      © ARVO (1962-2015); The Authors (2016-present)

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Introduction: Corrected myopes exhibit larger visual acuity loss at low luminance (1, 2) and less precise fixational eye movements (3) than emmetropes. We examined the relationship between fixation stability and acuity at two light levels.

Methods: Subjects (31 young adults; dominant eye refraction +2.25 to −10.88 D) were corrected with contact lenses if needed. Mesopic (0.276 cd/m2) and photopic (325 cd/m2) acuity was measured while eye movements were recorded (EyeLink 1000). Fixations were analyzed for letter sizes corresponding to mesopic and photopic acuity limits. Fixation stability is reported as the bivariate contour ellipse area (BCEA), defined as the area of fixation for 68% of the time (4), during acuity reading.

Results: Mesopic acuity was worse for higher myopia (p=0.03) and BCEA were larger for myopes at both light levels (mesopic, p<0.01; photopic, p<0.01). Subjects with smaller photopic BCEA had higher mesopic acuity (p=0.01) and smaller loss of acuity in dim light (p=0.02) relative to their photopic acuity.

Conclusions: Fixation instability in myopia may be associated with difficulty in visual tasks under challenging conditions, such as low luminance.

Meeting abstract presented at the 2016 OSA Fall Vision Meeting

Coletta, N.J., Moskowitz, A.Wavefront aberrations and mesopic visual performance following soft contact lens removal Journal of Vision 2003. 3(12): 37a–
Coletta, N.J., Frericks, M., Groves, R. 2007. Mesopic visual acuity in myopia Investigative Ophthalmology and Visual Science 48 (ARVO E-abstract 1009)
Coletta, N.J., Walker, L.E., Vera-Diaz, F. 2016. Fixation instability in myopia Investigative Ophthalmology and Visual Science 57 (ARVO E-abstract 199)
Raveendran, R. N., Babu, R.J., Hess, R.F., Bobier, W.R. 2014. Transient improvements in fixational stability in strabismic amblyopes following bifoveal fixation and reduced interocular suppression Ophthal. Physiol. Optics 34214–225 [CrossRef]
 This work was supported by NEI T35 training grant EY007149.

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