Axial Elongation During Short-Term Accommodation in Myopic and Nonmyopic Children

A range of ocular biometric measurements were captured during brief accommodation tasks (0, 3, 6, and 9 D) using a Badal optometer mounted to a noncontact optical biometer (Zeiss IOLMaster 700). Reliable measurements were captured for 15 myopic and 15 age- and sex-matched nonmyopic children. The average central corneal thickness (CCT), anterior chamber depth (ACD), crystalline lens thickness (LT), anterior segment length (ASL), vitreous chamber depth (VCD), and axial length (AL) were determined for each accommodation stimulus. Raw measurements of AL and VCD were corrected for the estimated error associated with LT increases during accommodation. Linear mixed models using fixed factors of accommodation stimulus and refractive error group, and their interaction, were conducted for each parameter.

在简短的调节任务（0, 3, 6, 及 9 D）期间，采用安装于非接触式光学生物测量仪（蔡司 IOLMaster 700）上的Badal视度计，对一系列眼生物测量参数进行了采集。对于15名近视儿童及15名年龄和性别匹配的非近视儿童，均成功获取了可靠的测量数据。针对每一项调节刺激，确定了平均中央角膜厚度（CCT）、前房深度（ACD）、晶状体厚度（LT）、前段长度（ASL）、玻璃体腔深度（VCD）以及轴向长度（AL）。对轴向长度（AL）和玻璃体腔深度（VCD）的原始测量值进行了校正，以消除调节过程中晶状体厚度增加所引起的估计误差。对每个参数，均进行了线性混合模型的构建，模型中包含调节刺激和屈光误差组别作为固定因素，以及它们之间的交互作用。