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Vertical imbalance induced by prism‐ballasted soft toric contact lenses fitted unilaterally
Author(s) -
Nilsson M.,
Stevenson S. B.,
Leach N.,
Bergmanson J. P.,
Brautaset R. L.
Publication year - 2008
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.2008.00538.x
Subject(s) - vergence (optics) , contact lens , binocular vision , optics , refractive error , adaptation (eye) , prism , fixation (population genetics) , optometry , lens (geology) , mathematics , geology , physics , medicine , visual acuity , environmental health , population
Fitting a prism‐ballasted soft toric contact lens unilaterally may potentially induce a vergence error that the subject cannot compensate. In the present study, a prism‐ballasted (1.5Δ base down) soft toric contact lens was fitted in the right eye only of 10 subjects with normal binocular vision. The effect on binocular vision was evaluated by measuring vertical phoria adaptation and vertical fixation disparity adaptation. The results show that the vertical vergence error induced was well compensated and fully adapted to. However, care might be needed when fitting these lenses unilaterally in subjects with vertical phoria‐related problems.