Biscevic Alma, Ahmedbegovic-Pjano Melisa, Grisevic Senad, Bejdic Nita, Gilevska Fanka, Patel Sudi
Laser and Refractive Surgery, Eye Clinic Svjetlost, Sarajevo, Bosnia, Herzegovina.
Laser and Refractive Surgery, Eye Clinic Svjetlost, Zagreb, Croatia.
Clin Ophthalmol. 2024 Jun 4;18:1587-1597. doi: 10.2147/OPTH.S463305. eCollection 2024.
To determine if factors pertaining to corneal thickness and elevation were linked to the prescribed back optic zone radius and overall diameter in keratoconus (group I), and cross-linked keratoconus (group II), cases successfully fitted with rigid contact lenses.
A review of cases adapted to contact lens wear (Rose K™) and assessed using Pentacam™ (for corneal anterior surface topography, astigmatism, elevation, and topographic thickness variation) was undertaken to determine the significance of any correlation with comfort, lens usage, grading of keratoconus, corrected distance visual acuity (with glasses and contacts), refractive error, prescribed lens powers, back optic zone radius and overall diameter values were assessed.
Chief findings were, comfort was rated highly, lenses were worn for more than 10 hours/day in 75% of cases. RCL corrected distance logMAR acuities (median, mode, inter-quartile ranges) were 0.11, 0.12 (0.08-0.13) and 0.08, 0.08 (0.06-0.11) in groups I and II, respectively. Multiple linear regression revealed significant correlations (p<0.01) between the [A] back optic zone radius, the thinnest value of corneal thickness (x1) and anterior corneal surface elevation (x2). The respective r values were 0.471 in group I and 0.512 in group II. [B] overall diameter, x1 and x2. The respective r values were 0.282 in group I and 0.505 in group II.
RCLs were well-tolerated in both groups. The r values imply there is a 50% chance of correctly predicting the suitable back optic zone radius in both groups, a 50% chance of correctly predicting the overall diameter in group II and 28% in group I cases using just x1 and x2. The thinnest value of corneal thickness and anterior corneal surface elevation could be used to quickly select the BOZR and OD during RCL fitting. This has the potential to reduce chair-time, waste and improve efficiency.
确定与角膜厚度和高度相关的因素是否与圆锥角膜（I组）和交联圆锥角膜（II组）中规定的后光学区半径和总直径相关，这些病例均成功验配了硬性接触镜。
回顾适合佩戴接触镜（Rose K™）并使用Pentacam™进行评估（用于角膜前表面地形图、散光、高度和地形图厚度变化）的病例，以确定与舒适度、镜片使用情况、圆锥角膜分级、矫正远视力（戴眼镜和接触镜时）、屈光不正、规定的镜片度数、后光学区半径和总直径值之间任何相关性的意义。
主要发现为，舒适度评分很高，75%的病例每天佩戴镜片超过10小时。I组和II组中，RCL矫正远视力的logMAR值（中位数、众数、四分位间距）分别为0.11、0.12（0.08 - 0.13）和0.08、0.08（0.06 - 0.11）。多元线性回归显示，[A]后光学区半径、角膜厚度最薄值（x1）和角膜前表面高度（x2）之间存在显著相关性（p<0.01）。I组和II组各自的r值分别为0.471和0.512。[B]总直径、x1和x2。I组和II组各自的r值分别为0.282和0.505。
两组对RCL的耐受性都很好。r值表明，仅使用x1和x2时，两组中有50%的概率能正确预测合适的后光学区半径，II组中有50%的概率能正确预测总直径，I组中有28%的概率。角膜厚度最薄值和角膜前表面高度可用于在RCL验配期间快速选择BOZR和OD。这有可能减少检查时间、浪费并提高效率。
