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Hiroshi Uozato, Maki Shindo, Yuko Shibata, Takushi Kawamorita, Takushi Kawamorita; Imaging Properties Of Astigmatic Eyes At Near Vision. Invest. Ophthalmol. Vis. Sci. 2012;53(14):156.
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© ARVO (1962-2015); The Authors (2016-present)
To compare accommodative response in with-the-rule (WTR) and against-the-rule (ATR) astigmatism while viewing vertical and horizontal line target at near vision.
Accommodative response was measured at 33cm while subjects viewed through dichroic mirror window in the Grand Seiko WAM-5500 binocular open-field autorefractor. Astigmatic blur was induced in fifteen healthy subjects (ages 19 - 26 years; mean spherical equivalent - 2.54 D; cylinder < - 0.75D) using plus cylinder lens (+0.00 D to +3.00D) for orientation control. Targets were a vertical line and a horizontal line. Each consisted of 40mm long and 1mm wide. Spherical equivalent measurements of approximately - 3.00D would indicate that subjects were accommodating to the 33cm target. For each targets, the mean of spherical equivalent data were calculated.
With WTR astigmatism ≥ 1.00D, the mean of the accommodative response obtained with the vertical line target were greater than with the horizontal line target( p < 0.05). With ATR astigmatism ≥ 1.00D, the mean of the accommodative response obtained with the horizontal line target were greater than with vertical the line target( p < 0.05).
Posterior focal plane is better focus position than anterior focal plane while viewing a line target parallel to the steeper meridian in eyes. In the eyes with astigmatism, the uncorrected accommodative response varied according to the orientation of visual target.
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