Factors Influencing Pseudo-Accommodation-The Difference between Subjectively Reported Range of Clear Focus and Objectively Measured Accommodation Range.
aberrations
depth of focus
objective accommodation
presbyopia
pupil size
subjective range of focus
tolerance to blur
Journal
Vision (Basel, Switzerland)
ISSN: 2411-5150
Titre abrégé: Vision (Basel)
Pays: Switzerland
ID NLM: 101733282
Informations de publication
Date de publication:
28 Jun 2019
28 Jun 2019
Historique:
received:
28
03
2019
revised:
06
06
2019
accepted:
20
06
2019
entrez:
19
11
2019
pubmed:
19
11
2019
medline:
19
11
2019
Statut:
epublish
Résumé
The key determinants of the range of clear focus in pre-presbyopes and their relative contributions to the difference between subjective range of focus and objective accommodation assessments have not been previously quantified. Fifty participants (aged 33.0 ± 6.4 years) underwent simultaneous monocular subjective (visual acuity measured with an electronic test-chart) and objective (dynamic accommodation measured with an Aston open-field aberrometer) defocus curve testing for lenses between +2.00 to -10.00 DS in +0.50 DS steps in a randomized order. Pupil diameter and ocular aberrations (converted to visual metrics normalized for pupil size) at each level of blur were measured. The difference between objective range over which the power of the crystalline lens changes and the subjective range of clear focus was quantified and the results modelled using pupil size, refractive error, tolerance to blur, and ocular aberrations. The subjective range of clear focus was principally accounted for by age (46.4%) and pupil size (19.3%). The objectively assessed accommodative range was also principally accounted for by age (27.6%) and pupil size (15.4%). Over one-quarter (26.0%) of the difference between objective accommodation and subjective range of clear focus was accounted for by age (14.0%) and spherical aberration at maximum accommodation (12.0%). There was no significant change in the objective accommodative response (F = 1.426,
Identifiants
pubmed: 31735835
pii: vision3030034
doi: 10.3390/vision3030034
pmc: PMC6802792
pii:
doi:
Types de publication
Journal Article
Langues
eng
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