Comas M, Castells X, Acosta E R, Tuñí J
Evaluation and Clinical Epidemiology Department, Institut Municipal d'Assistència Sanitària (IMAS), Barcelona, Spain.
Eye (Lond). 2007 Jun;21(6):702-7. doi: 10.1038/sj.eye.6702305. Epub 2006 Mar 3.
To assess the association of stereopsis with differences between eyes (better minus worse eye value) and the binocular value of visual acuity and contrast sensitivity, and to analyse binocular summation or inhibition phenomena owing to differences between eyes.
A cohort of 137 patients with bilateral cataracts (visual acuity of 0.3 LogMAR or worse in both eyes) was followed up through first- and second-eye cataract surgery. The patients were recruited from the ophthalmology departments of two teaching hospitals. Visual acuity, contrast sensitivity (monocular and binocular), and stereopsis were measured preoperatively, after first- and second-eye surgery. Multiple linear regression and local correlation analyses were used.
Stereopsis was most strongly influenced by visual acuity in the postoperative period after first-eye surgery (standardized coefficients of 0.382 for difference between eyes and 0.356 for binocular visual acuity) and by contrast sensitivity in the postoperative period after second-eye surgery (standardized coefficients of 0.353 for the difference between eyes and -0.312 for binocular contrast sensitivity). After first-eye surgery, the correlation of the differences between eyes with stereopsis was stronger (between 0.4 and 0.5) when the differences were greater than 0.4 logMAR units for visual acuity. Slight binocular summation was found for contrast sensitivity.
When assessing the indication for and outcomes of cataract surgery, analysis of visual function should include measures of both eyes, rather than measures of the operative eye only, as differences between eyes (better minus worse eye value) may play an important role in binocular measures such as stereopsis.
评估立体视与双眼差异（较好眼视力减去较差眼视力的值）以及双眼视力和对比敏感度值之间的关联，并分析由于双眼差异导致的双眼总和或抑制现象。
对137例双侧白内障患者（双眼视力为0.3 LogMAR或更差）进行了第一眼和第二眼白内障手术的随访。这些患者是从两家教学医院的眼科招募的。在术前、第一眼手术后和第二眼手术后测量视力、对比敏感度（单眼和双眼）以及立体视。采用多元线性回归和局部相关性分析。
立体视在第一眼手术后的术后阶段受视力影响最大（双眼差异的标准化系数为0.382，双眼视力的标准化系数为0.356），在第二眼手术后的术后阶段受对比敏感度影响最大（双眼差异的标准化系数为0.353，双眼对比敏感度的标准化系数为-0.312）。第一眼手术后，当视力差异大于0.4 logMAR单位时，双眼差异与立体视的相关性更强（在0.4至0.5之间）。对比敏感度存在轻微的双眼总和现象。
在评估白内障手术的适应证和结果时，视觉功能分析应包括双眼的测量，而不仅仅是手术眼的测量，因为双眼差异（较好眼减去较差眼的值）可能在诸如立体视等双眼测量中起重要作用。
