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 (τrelax), the stabilisation time (Tmax) and the number of oscillations (Nosc).
Results
The MFCLs did not produce a significant difference in the mean values of the analysed parameters (p > 0.05 for τrelax, Tmax, Nosc). However, a positive correlation was found between pupil size and Nosc and Tmax (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.
N a j w a ż N i e j s z eMiękkie multifokalne soczewki kontaktowe nawet z wysokimi addycjami nie osłabiają znacząco koordynacji oko-ręka ani nie spowalniają latencji ruchów oczu.
H i g H l i g H t sSoft multifocal contact lenses, even with high additions, do not significantly reduce eye-hand coordination or eye movements latency.
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