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How does Bangerter filter affect the normal visual perception?
Author(s) -
LI J,
DING Z,
DENG D,
CHAN YLL,
BENJAMIN T,
CHEN X,
HESS RF,
YU M
Publication year - 2011
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2011.467.x
Subject(s) - visual acuity , contrast (vision) , psychology , audiology , ophthalmology , optometry , medicine , optics , physics
Purpose The Bangerter filter (BF) has become an alternate form of amblyopia patching treatment due to its high social‐psychological compliance and effective therapeutic outcomes. This study aims to investigate the effects of different BF densities on the normal visual system in order to quantify filter densities based on vision perception variables. Methods Thirty‐two binocularly normal subjects participated in this study. Visual acuity (VA), vernier acuity (VNA) and contrast sensitivity (CS) under spatial frequencies (SF) of 0.5, 1, 2, 5, 10 cyl/deg were measured while the dominant eye was patched with randomly selected BF of densities: 0.8, 0.6, 0.4, 0.2. Results Mean VA and VNA values under the four BF densities were a) 0.29, 0.30, 0.35, 0.54 logMAR and b) 3.24, 4.81, 5.29, 8.19 min of arc respectively. There was a significant difference (p<0.05) in VA change between BF 0.2 and rest of the density groups. BF 0.8 and 0.2 groups showed a significant VNA change compared to BF 0.6 and 0.4 (p<0.05). There were no significant effects noted in CS at SF of 0.5, 1 and 2 cyl/deg across low to high BF groups (p>0.05). BF 0.2 was the only density that had a significant influence on middle and high SF (5 and 10 cyl/deg) (p<0.05). Conclusion BF does not alter vision perception abilities in a predictable manner suggested by the manufacturer. Only the high BF density has shown a significant change. Careful attention must be paid on the inconsistencies in low and middle BF densities for the patching treatment.