Fernández-Sánchez Vicente, Ponce M Eugenia, Lara Francisco, Montés-Micó Robert, Castejón-Mochón José F, López-Gil Norberto
Vision Science Group, Institute on Aging, University of Murcia, Murcia, Spain.
J Cataract Refract Surg. 2008 Aug;34(8):1339-44. doi: 10.1016/j.jcrs.2008.04.017.
To investigate the effect of 3rd-order aberrations on human vision.
Grupo de Ciencias de la Visión, University of Murcia, Murcia, Spain.
The 3rd-order aberrations coma and trefoil were induced with purpose-designed soft contact lenses, 3 inducing coma (low [0.05 microm], medium [0.13 microm], high [1.03 microm]) and 3 inducing trefoil (low [0.07 microm], medium [0.17 microm], high [0.96 microm]). Monocular high-contrast (HCVA) and low-contrast (LCVA) visual acuities and contrast sensitivity were measured in 11 subjects wearing contact lenses with a 5.0 mm artificial pupil.
The reduction in HCVA and LCVA was statistically significant only for the highest coma and trefoil values (P<.0001). For coma, the mean change in HCVA was 0.193 logMAR +/- 0.100 (SD) and in LCVA, 0.386 +/- 0.136 logMAR. For trefoil, it was 0.204 +/- 0.128 logMAR and 0.395 +/- 0.141 logMAR, respectively. No differences were found for the lower degrees (P>.2). Contrast sensitivity was significantly reduced with the highest coma and trefoil values (P<.0001) (mean change 0.390 +/- 0.157 and 0.404 +/- 0.135, respectively). Lower degrees did not cause significant changes in contrast sensitivity (P>.1). The effect of induced coma and trefoil on HCVA, LCVA, and contrast sensitivity was similar at each level of induced aberration (P>.01).
Large values of coma and trefoil (approximately 1 mum) significantly reduced visual performance. Only patients with high 3rd-order aberrations, such as those that occur in refractive surgery or in cases of distorted optics, would benefit from this correction.
研究三阶像差对人眼视觉的影响。
西班牙穆尔西亚大学视觉科学小组。
使用专门设计的软性隐形眼镜诱导三阶像差彗差和三叶草像差，其中3种诱导彗差（低[0.05微米]、中[0.13微米]、高[1.03微米]），3种诱导三叶草像差（低[0.07微米]、中[0.17微米]、高[0.96微米]）。对11名佩戴5.0毫米人工瞳孔隐形眼镜的受试者测量单眼高对比度（HCVA）和低对比度（LCVA）视力以及对比敏感度。
仅在彗差和三叶草像差的最高值时，HCVA和LCVA的降低具有统计学意义（P<0.0001）。对于彗差，HCVA的平均变化为0.193 logMAR±0.100（标准差），LCVA为0.386±0.136 logMAR。对于三叶草像差，分别为0.204±0.128 logMAR和0.395±0.141 logMAR。较低度数时未发现差异（P>0.2）。最高彗差和三叶草像差值时对比敏感度显著降低（P<0.0001）（平均变化分别为0.390±0.157和0.404±0.135）。较低度数未引起对比敏感度的显著变化（P>0.1）。在每个诱导像差水平上，诱导彗差和三叶草像差对HCVA、LCVA和对比敏感度的影响相似（P>0.01）。
彗差和三叶草像差的大值（约1微米）显著降低视觉性能。只有三阶像差高的患者，如屈光手术或光学畸变情况下出现的患者，才会从这种矫正中受益。
