Purpose:
To investigate the dynamics of wavefront aberrations of thehuman eye during accommodating.
Methods:
An "E" card which can move from 5m to 0.1m was presented infront of eyes. Different accommodation levels were evoked whenthe subjects watched the movement of the card. Wavefront aberrationsof 21 normal subjects (emmetropia, vision acuity ≥20/20) weremeasured using Hartmann-shark aberrometer under different accommodationlevels (From 0D to 5D).
Results:
Table 1 shows the Root Mean Square (RMS) of eye’s totalwavefront aberrations and high-order wavefront aberrations ofdifferent accommodation levels. The RMS values of both aberrationsdecreased when the accommodation condition changed from relaxationto tension. Table 2 shows the pupil size and the proportionof high-order wavefront aberrations under different accommodationlevels. The proportion of high-order aberrations was very stableunder different accommodation levels, while the pupil size decreasedas the accommodation levels increased.Table1: RMS values ofeye’s total wavefront aberrations and high-order wavefrontaberrations under different accommodation levels:Table2 : Pupil size and proportion of high-orderaberration under different accommodation levels
Conclusions:
The eye’s total wavefront aberrations decreased undera tensional accommodation condition compared to that under arelaxable accommodation condition. Although the pupil size alsodecreased when the accommodation level increased, the proportionof high-order aberrations did not change significantly and waskept at a high level.
Keywords: aberrations • accomodation • optical properties