Department of Ophthalmology, Sakarya University Medical Education and Research Hospital, Sakarya, Turkey.
Ir J Med Sci. 2022 Oct;191(5):2399-2403. doi: 10.1007/s11845-021-02830-w. Epub 2021 Nov 13.
To evaluate the effect of pterygium surgery on intraocular lens (IOL) power and ocular biometric parameters and to evaluate the factors affecting these parameters.
Twenty-eight eyes of 25 patients diagnosed with pterygium were evaluated. Axial length (AL), mean keratometry (Sim K), K1, K2, anterior chamber depth (ACD), corneal astigmatism, and ocular biometry parameters were obtained with a dual Scheimpflug analyzer. Pterygium sizes (horizontal, vertical) were measured manually, and pterygium height was analyzed with anterior segment optic coherence tomography. IOL power was calculated according to SRK/T, SRK II, Hoffer Q, Haigis, and Holladay formulas. Limbal conjunctival autograft was performed in all patients after excisional pterygium surgery. Preoperative and postoperative 1st month measurements were analyzed and compared.
The mean age of the patients was 51.5 ± 13.8 years. Mean horizontal pterygium length, vertical width, height, and percentage extension of the pterygium were 2.4 ± 0.9, 4.7 ± 1.0 mm, 297 ± 93µm, and 20.2 ± 7.2%, respectively. There was a significant increase in Sim K, K1, and K2 values postoperatively. Postoperative IOL power was significantly lower than preoperative values in all formulas. The change in IOL power after surgery was -0.3 ± 0.6D in the SRKT, -0.3 ± 0.5D in SRK II, -0.4 ± 0.7D in Hoffer Q, -0.5±0.7D in Haigis, and -0.3 ± 0.7D in Holladay 2 formulas. The change in IOL power has a moderate positive linear correlation with the horizontal and vertical sizes of the pterygium and a high positive linear correlation with the percentage extension of the pterygium.
Pterygium surgery causes a significant decrease in calculated IOL power obtained with all formulas. It becomes more pronounced with the increase in the size of the pterygium.
评估翼状胬肉手术对人工晶状体（IOL）屈光力和眼生物测量参数的影响，并评估影响这些参数的因素。
评估了 25 名患者的 28 只眼，这些患者均被诊断为翼状胬肉。使用双 Scheimpflug 分析仪获得眼轴（AL）、平均角膜曲率（Sim K）、K1、K2、前房深度（ACD）、角膜散光和眼生物测量参数。手动测量翼状胬肉的大小（水平、垂直），并用眼前节光学相干断层扫描分析翼状胬肉高度。根据 SRK/T、SRK II、Hoffer Q、Haigis 和 Holladay 公式计算 IOL 屈光力。所有患者在翼状胬肉切除手术后均行角膜缘结膜自体移植。分析并比较术前和术后 1 个月的测量值。
患者的平均年龄为 51.5±13.8 岁。翼状胬肉的平均水平长度、垂直宽度、高度和翼状胬肉的扩展百分比分别为 2.4±0.9、4.7±1.0mm、297±93μm 和 20.2±7.2%。术后 Sim K、K1 和 K2 值显著增加。所有公式计算的术后 IOL 屈光力均显著低于术前值。手术后 IOL 屈光力的变化在 SRKT 中为-0.3±0.6D，在 SRK II 中为-0.3±0.5D，在 Hoffer Q 中为-0.4±0.7D，在 Haigis 中为-0.5±0.7D，在 Holladay 2 公式中为-0.3±0.7D。IOL 屈光力的变化与翼状胬肉的水平和垂直尺寸呈中度正线性相关，与翼状胬肉的扩展百分比呈高度正线性相关。
翼状胬肉手术会导致所有公式计算的人工晶状体屈光力显著下降。随着翼状胬肉大小的增加，下降幅度更为明显。
