METHODS: This retrospective, consecutive case series included 72 eyes of 72 patients who underwent PPV with 5000-centistokes SO endotamponade between July 2018 and June 2023. Pseudophakic eyes and eyes with a combined phacovitrectomy were excluded. Primary endpoints were keratometry values, anterior chamber depth (ACD), lens thickness (LT), horizontal corneal diameter (HCD), and axial length (AL) measured by swept-source optical coherence tomography-based biometry (IOLMaster 700) preoperatively and six weeks postoperatively. A recently described formula was used to adjust the AL (aAL) in eyes with SO endotamponade and a theoretical intraocular lens (IOL) calculation was performed.
RESULTS: The mean age was 62.1 ± 8.3 years (range: 37-85). After PPV with SO fill, there was an increase in Kmean (0.19 ± 0.51D), while ACD (0.05 ± 0.13 mm), LT (0.03 ± 0.14 mm), and HCD (0.02 ± 0.24 mm) decreased. Preoperatively, the mean AL was 25.22 ± 1.78 mm, while postoperatively the AL was overestimated by 0.12 ± 0.42 mm on average (p = 0.04). By adjusting the AL, the mean difference could be reduced to -0.002 ± 0.41 mm. The aAL resulted in a difference in the refractive outcome in eyes with an AL > 25 mm of 0.34 ± 0.10D in the IOL calculation.
CONCLUSIONS: While changes in biometry after PPV with SO endotamponade in the anterior segment are clinically less relevant, a considerable overestimation of AL with IOLMaster 700 was found. We recommend the use of a recently introduced formula for adjusting AL in eyes with SO, allowing overestimation to be minimised considerably.
方法:本回顾性研究,连续病例系列包括在2018年7月至2023年6月期间接受PPV治疗的72例患者的72只眼睛,这些患者在5,000厘斯内填塞.排除了假晶状体眼和联合晶状体切除术的眼睛。主要终点是角膜曲率测量值,前房深度(ACD),透镜厚度(LT),角膜水平直径(HCD),术前和术后六周通过基于扫频源光学相干断层扫描的生物测量(IOLMaster700)测量的轴向长度(AL)。使用最近描述的公式来调整具有SO内填充剂的眼睛中的AL(aAL),并进行了理论人工晶状体(IOL)计算。
结果:平均年龄为62.1±8.3岁(范围:37-85岁)。在使用SO填充的PPV之后,Kmean增加(0.19±0.51D),而ACD(0.05±0.13mm),LT(0.03±0.14mm),HCD(0.02±0.24mm)下降。术前,平均AL为25.22±1.78mm,而术后AL平均高估了0.12±0.42mm(p=0.04)。通过调整AL,平均差可降至-0.002±0.41mm。aAL导致在IOL计算中AL>25mm为0.34±0.10D的眼睛中屈光结果的差异。
结论:虽然在前段有SO内填充的PPV后,生物测量的变化在临床上较不相关,发现IOLMaster700对AL的高估。我们建议使用最近引入的公式来调整带有SO的眼睛中的AL,允许高估被大大减少。