Values assigned to global vision status (PVVS) and quality of vision questionnaire (QoV).

<p>Values assigned to global vision status (PVVS) and quality of vision questionnaire (QoV).</p

Clinical visual measures from 44 participants.

<p>Clinical visual measures from 44 participants.</p

Visual history and refractive correction in referees and assistant referees by subcategory (international and national).

<p>Visual history and refractive correction in referees and assistant referees by subcategory (international and national).</p

Flow chart summarizing participant recruitment.

<p>CAFPF: Conselho de Arbitragem da Federação Portuguesa de Futebol (Portuguese Referee's Committee); QoV: quality of vision questionnaire [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0188463#pone.0188463.ref012" target="_blank">12</a>]; PVVS: rating-scale to measure the preference values that officials assign to their global vision status [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0188463#pone.0188463.ref013" target="_blank">13</a>]; VA: visual acuity; CS: contrast sensitivity.</p

Results obtained with the pinhole disc.

<p>Results obtained with the pinhole disc.</p

Published normative test performative for young adults compared to performance averages exhibited by participants in the present study.

<p>Published normative test performative for young adults compared to performance averages exhibited by participants in the present study.</p