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Computerised dynamic posturography for postural control assessment in subjects wearing multifocal contact lenses dedicated for myopia control
Author(s) -
Przekoracka Katarzyna,
Michalak Krzysztof Piotr,
Olszewski Jan,
Michalski Andrzej,
PrzekorackaKrawczyk Anna
Publication year - 2021
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/opo.12818
Subject(s) - posturography , eyes open , balance (ability) , pupil size , audiology , psychology , optometry , ophthalmology , physical medicine and rehabilitation , medicine , pupil , neuroscience
Purpose To measure body balance using computerised dynamic posturography in young adults wearing multifocal contact lenses (MFCL) with high addition powers designed for myopia control. Methods Twenty‐four young adults (mean age: 24 years) wearing distance‐centred soft MFCL (SwissLens Orbis Relax) with two different central zones (3 and 4.5 mm), two addition powers (+2 D, +4 D) and single vision control lenses. Body balance was measured on a moving platform under three viewing conditions: (1) eyes open when fixating on letters at 3 m or (2) at 40 cm, as well as (3) with the eyes closed. Parameters of body stabilisation were analysed: the rate of body stabilisation (τ relax ), the stabilisation time (T max ) and the number of oscillations (N osc ). Results The MFCLs did not produce a significant difference in the mean values of the analysed parameters ( p > 0.05 for τ relax, T max, N osc ). However, a positive correlation was found between pupil size and N osc and T max ( p < 0.01), suggesting an effect of the +4 D add with the 3 mm central zone on the posturographic parameters. As was expected, dynamic body stabilisation was better with eyes open versus eyes closed ( p < 0.005). Conclusions Distance‐centred MFCLs with a medium addition (+2 D) do not disturb body stabilisation in young adults. However, high additions (+4 D) with a small central zone may affect body balance control in subjects with large pupil size.