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Viewing distance with minimum heterophoria.

Clin Exp Optom

January 1999

Department of Optometry, Faculty of Allied Health Services, National University of Malaysia (Universiti Kebangsaan Malaysia) Jalan Raja Muda Abdul Aziz, 50300, Kuala Lumpur, Malaysia.

BACKGROUND: The purposes of this study are to determine the viewing distance with minimum heterophoria and its relationship with refractive error and the resting position of accommodation. METHODS: The heterophoria and the accommodation responses of 36 optometry students (25 emmetropes and 11 myopes) were tested. Heterophoria was measured with the Free-Space Heterophoria Card at five different viewing distances (25 cm, 33 cm, 50 cm, 100 cm and 300 cm).

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