Assessing Dynamic Reading Behaviors Using Eye-Tracking Tobii Glasses

HYPOTHESIS:Horizontal convergence tracked with Tobii glasses is a reliable substitute for accommodation in young myopes and hyperopes with normal accommodative amplitudesYoung mypopes and hyperopes demonstrate different reading behaviors during near workAIMS & OBJECTIVES:Compare the accommodative responses measured with the Grand Seiko open-field autorefractor to those derived from the Tobii Glasses, when subjects wear (1) spectacle glasses, (2) single vision contact lenses (SVCLs), and (3) multifocal contact lenses (MFCLs).Investigate subjects' natural and dynamic accommodative behaviors and eye postures during reading using the Tobii Glasses.Compare the change in natural and dynamic accommodative behaviors and eye postures during reading between myopes and hyperopes using the Tobii Glasses.

Inclusion Criteria:Age: Subjects who are 18 to 30 years oldRefractive error: Subjects with myopia between -1.00 and -5.00 D in each eye (n = 5), or hyperopia between +2.00 and +5.00 D in each eye (n = 5), determined by spherical equivalent using dry manifest refraction and binocular balanceAstigmatism <= 0.75 D in each eyeAnisometropia <= 1.50 DBCVA at distance 20/20 in each eyeHabitual contact lens wears or willing to wear single vision and multifocal contact lenses during the 2nd study visitNormal eye posture and accommodationGood general and ocular healthExclusion Criteria:Strabismus at distance or nearAmblyopiaSignificant anisometropia (>1.50 D)