Camparini M, Macaluso C, Reggiani L, Maraini G
Institute of Ophthalmology, University of Parma, Italy.
Invest Ophthalmol Vis Sci. 2000 Sep;41(10):3074-9.
To investigate the relative merit of retroillumination and of reflected light slit-lamp-derived photographs in the assessment of the opacification of the posterior lens capsule.
Retroillumination and slit-lamp-derived reflected-light photographs were taken on 23 consecutive eyes with posterior capsule opacification (PCO) in uncomplicated pseudophakia. Subjective grading was performed on both types of photographs to evaluate the extent and density of posterior capsular opacification. Best-corrected visual acuity (BCVA) before and after YAG laser capsulotomy was used to assess the impact of capsular opacification on visual function.
After capsulotomy all patients attained a BCVA > or = 46 letters (> or =20/32) with a mean increase of 25 letters, indicating that PCO was the cause of visual impairment in these patients. The relative capacity of retroillumination and of reflected-light photographs to adequately capture the extent and the severity of posterior capsule opacification varied considerably. Reflected-light images, in addition to frequently producing higher severity scores for the opacity than retroillumination photographs, in 4 of 23 eyes (17.4%) proved to be the only technique able to document the presence of PCO.
Our results indicate that, with respect to retroillumination images, reflected-light photography has an increased ability to adequately capture the presence and the severity of PCO and that the use of only retroillumination images may lead to its underestimation. This may be relevant to clinical studies aiming to evaluate incidence and progression of this condition.
探讨后照法及裂隙灯反射光照片在评估晶状体后囊混浊方面的相对优势。
对23例单纯人工晶状体眼合并晶状体后囊混浊（PCO）的患者连续进行后照法及裂隙灯反射光摄影。对两种照片进行主观分级，以评估晶状体后囊混浊的程度和密度。采用YAG激光晶状体后囊切开术前、后的最佳矫正视力（BCVA）评估晶状体后囊混浊对视觉功能的影响。
晶状体后囊切开术后，所有患者的BCVA均≥46个字母（≥20/32），平均提高25个字母，表明PCO是这些患者视力损害的原因。后照法和反射光照片充分捕捉晶状体后囊混浊程度和严重程度的相对能力差异很大。反射光图像除了比后照法照片更频繁地产生更高的混浊严重程度评分外，在23只眼中有4只眼（17.4%）被证明是唯一能够记录PCO存在的技术。
我们的结果表明，与后照法图像相比，反射光摄影更有能力充分捕捉PCO的存在和严重程度，仅使用后照法图像可能会导致对其低估。这可能与旨在评估这种情况的发生率和进展的临床研究相关。
