Centre for Eye Health, University of New South Wales, Sydney, New South Wales, Australia.
School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia; Save Sight Institute and Discipline of Clinical Ophthalmology, Sydney Medical School, University of Sydney, New South Wales, Australia.
Surv Ophthalmol. 2016 Mar-Apr;61(2):211-27. doi: 10.1016/j.survophthal.2015.11.008. Epub 2015 Dec 8.
Vitreous is a hydrated extracellular matrix comprised primarily of water, collagens, and hyaluronan organized into a homogeneously transparent gel. Gel liquefaction results from molecular alterations with dissociation of collagen from hyaluronan and aggregation of collagen fibrils forming fibers that cause light scattering and hence symptomatic floaters, especially in myopia. With aging, gel liquefaction and weakened vitreoretinal adhesion result in posterior vitreous detachment, the most common cause of primary symptomatic floaters arising from the dense collagen matrix of the posterior vitreous cortex. Recent studies indicate that symptomatic floaters are not only more prevalent, but also have a negative impact on the quality of life that is greater than previously appreciated. We review the literature concerning management of symptomatic vitreous floaters, currently either with observation, vitrectomy, or Nd:YAG laser. Published evidence is consistent with a low-risk profile and excellent success rate for floater vitrectomy, particularly with sutureless small gauge instruments and a limited core vitrectomy without PVD induction. Nd:YAG laser treatment of floaters, reported less commonly, claims resolution of floaters ranging between 0% and 100%; however, both peer-reviewed literature and assertions on web-based nonpeer-reviewed laser vitreolysis sites remain to be substantiated, and at present only vitrectomy has proven value. Prospective studies using objective, quantitative outcome measures are required to assess the relative efficacy and safety of these two procedures as well as new therapies such as pharmacologic vitreolysis.
玻璃体是一种富含水分的细胞外基质,主要由水、胶原和透明质酸组成,组织成均匀透明的凝胶。凝胶液化是由于胶原与透明质酸分离以及胶原纤维聚集形成纤维导致光散射而引起的,从而导致有症状的漂浮物,尤其是在近视中。随着年龄的增长,凝胶液化和玻璃体视网膜黏附力减弱导致后玻璃体脱离,这是原发性有症状漂浮物最常见的原因,原发性有症状漂浮物源于后玻璃体皮质的密集胶原基质。最近的研究表明,有症状的漂浮物不仅更为普遍,而且对生活质量的负面影响也比以前认识到的更大。我们回顾了有关有症状玻璃体漂浮物治疗的文献,目前可选择观察、玻璃体切除术或 Nd:YAG 激光治疗。已发表的证据表明,漂浮物玻璃体切除术风险低,成功率高,尤其是使用无缝线小口径仪器和不诱导 PVD 的有限核心玻璃体切除术时。Nd:YAG 激光治疗漂浮物的报道较少,声称漂浮物的解决率在 0%到 100%之间;然而,同行评议文献和基于网络的非同行评议激光玻璃体溶解网站上的断言仍有待证实,目前只有玻璃体切除术被证明有价值。需要进行前瞻性研究,使用客观、定量的结果测量来评估这两种手术以及新疗法(如药物性玻璃体溶解)的相对疗效和安全性。