Dallos Award 2014: Effects on binocular and peripheral visual functions of distance center multifocal soft contact lens designs and significance of add power

The efficacy of multifocal soft contact lenses for the alleviation of asthenopic symptoms in myopes with accommodative lag

“…However, the present study's cohort, selected to have manifest accommodative lag and symptoms of asthenopia, failed to exhibit any significant change in lag for any contact lens condition, despite a marked improvement in CISS score with multifocal contact lens wear. This finding is, however, consistent with several other studies which have used centre-near [38,39,[55][56][57] or centredistance multifocal lenses [35] and have detected no significant change in accommodative lag compared to single vision distance contact lenses. Conversely, some studies have reported an increase in lag [34,35,58], while one study investigating bifocal contact lenses found that lag decreased [20].…”

“…This finding is, however, consistent with several other studies which have used centre-near [38,39,[55][56][57] or centredistance multifocal lenses [35] and have detected no significant change in accommodative lag compared to single vision distance contact lenses. Conversely, some studies have reported an increase in lag [34,35,58], while one study investigating bifocal contact lenses found that lag decreased [20]. It should be noted, however, that these studies were pilot investigations, with data collected on a single occasion, with minimal adaptation time, a limited range of multifocal contact lenses, and in most cases a very limited sample size.…”

“…Although multifocal soft contact lenses were originally designed to incorporate a near addition prescription in the contact lens to provide clearer vision for presbyopes, studies have suggested that multifocal soft contact lenses could also be used as a possible correcting option to reduce accommodation and binocular dysfunction of pre-presbyopes [34][35][36][37][38][39]. However, the ability of multifocal soft contact lenses as a successful treatment option for ocular asthenopia varies, and is not entirely understood [40,41].…”