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This study was conducted to compare and analyze the effect of near visual media luminance on accommodative response (AR) and accommodative lag (AL) between emmetropia and myopia, and found out the near visual media to be caused burdensome on eyes in terms of AR and AL. Methods: Forty adult men and women (40 eyes) with ages averaging 22.57±2.07 years, who were not accommodative function disorder. 11 adults were emmetropes (average spheric equivalent power-0.34±0.22 D) and 29 adults were myopes (average spheric equivalent power-3.86±1.69 D). AR was measured and compared by using both eyes open view auto refractometer in the case looking at the near visual media (near standard target, print paper, newspaper, magazine, smartphone, monitor). Results: AR was lower and AL was higher in the case looking at the luminous visual media (smartphone, monitor) than the non-luminous visual media (near standard target, print paper, newspaper, magazine). AR (F=2.622, P=0.033) and AL (F=2.593, P=0.034) among different luminance of near visual media in emmetropes wear not statistically significant, However, AR was the lowest as 1.32±0.26 D (F=5.924, P=0.000), AL was the highest as 0.90±0.24 D (F=6.007, P=0.000) in the case looking at the monitor with the highest luminance and the widest screen size in myopes. Conclusions: When the myopes looking at the luminous visual media which includes high luminance and wide screen size is considered to be more burdensome on eyes than the emmetropes looking at the luminous visual media in terms of AR and AL.

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This study was conducted to research effects of influence factors on stereopsis of induced aniseikonia in emmetropia. Methods: 20 college students (a mean age of 22.50±2.72 years, 14 males, 6 females) were selected as subjects and all of them had no ocular disease or systemic disease, the refractive correction of spherical equivalent within ±0.50 D, the corrected visual acuity of 1.0 or better and the aniseikonia values less than 1% by AWAYA. Subject's dominant eye was checked by Hole in card method and contact lenses of −7.00 ~ +7.00 D were fitted to cause anisometropia in dominant eye or non-dominant eye, respectively. And then aniseikonia was induced with spectacles to correct refractive error by contact lenses. Stereopsis was measured by Random Dot Stereo Acuity Test with LEA symbols ® (Vision Assessment Corporation TM , USA). Results: Stereopsis was remarkably reduced by inducing aniseikonia, with induced aniseikonia in dominant eye, with higher diopter of wearing contact lenses to induce anisometropia, with spectacles lenses correction of minus power after fitting contact lenses with plus power and in case of men. Conclusions: It should be considered to correct anisometropia that aniseikonia could cause reduction of stereopsis.

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