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Reading performance in infantile nystagmus.

Niraj Barot¹, Rebecca J McLean, Irene Gottlob

¹Ophthalmology Group, Faculty of Medicine & Biological Sciences, University of Leicester, Leicester Royal Infirmary, Leicester, United Kingdom.

|March 7, 2013

Summary

Infantile nystagmus (IN) patients experience slower reading speeds, but optimal font sizes can improve performance. Visual acuity and nystagmus severity are poor predictors of reading ability in IN.

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Area of Science:

Ophthalmology
Neuroscience

Background:

Infantile nystagmus (IN) is a condition affecting vision and eye movements.
Reading deficits are common in individuals with IN, impacting their daily lives.

Purpose of the Study:

To characterize reading deficits in infantile nystagmus (IN).
To determine optimal font sizes for reading in IN.
To investigate the predictive value of visual acuity (VA) and nystagmus severity on reading performance.

Main Methods:

A prospective cross-sectional study involving 71 participants with IN (idiopathic and albinism) and 20 controls.
Reading performance assessed using Radner reading charts.
Comparison of reading metrics with near logarithm of the minimum angle of resolution (logMAR) VA, nystagmus intensity, and foveation characteristics.

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Main Results:

Maximum reading speeds were reduced in IN patients (18.8% in albinism, 14.7% in idiopathic) compared to controls.
Reading acuity was significantly worse in IN patients.
Near VA was a poor predictor of maximum reading speed; nystagmus intensity and foveation were poor indicators of reading acuity and speed.

Conclusions:

Optimal font sizes can significantly improve reading speed in IN patients, even with poor VA or intense nystagmus.
Reading performance in IN is highly sensitive to font size.
Optimal font sizes for reading in IN may be substantially larger than indicated by near VA.