Comparison of Anterior Corneal Optical Aberration Induced by Conductive Keratoplasty and Hyperopic Laser in Situ Keratomileusis
试验速览
- 阶段
- 不适用
- 发起方
- 入组人数
- 69
- 试验地点
- 1
- 主要终点
- uncorrected visual acuity
研究概览
简要总结
Conductive keratoplasty (CK) had shown to be a safe and effective procedure for the treatment of low to moderate hypeopia. It had been approved by the U.S. Food and Drug Administration (FDA) to treat presbyope in early 2004. CK appeals to both surgeons and patients as it avoids the need for flap creation, the use of high intraocular pressure (IOP), or tissue ablation. It utilizes "blended vision" rather than the true monovision used with laser in situ keratomileusis (LASIK), which patients tolerate more readily. There is very little reported research about the induction of wavefront aberration by CK. The symptomatology of high order aberrations (HOA) and the way individual Zernike functions were correlated with visual acuity, contrast sensitivity, visual symptoms. This study measured the HOA created by surgically induced myopic shift via CK and LASIK in an effort to better understand the phenomena of regression, multifocality, pseudo-accommodation and monovision.
详细描述
To investigate anterior corneal optical higher order aberration (HOA) induced by conductive keratoplasty (CK) and laser in situ keratomileusis (LASIK). 69 eyes with hyperopia or presbyopia were enrolled. 47 eyes of 47 patients underwent CK procedure, 22 eyes underwent LASIK. Data were acquired preoperatively, and at 3 and 6 months postoperatively. The total Root Mean Square (RMS) of the HOA as well as the individual Zernike polynomials of coma, trefoil, and spherical aberration were analyzed. In CK group, the high order RMS showed significant elevation at 3 months, but it returned to near preoperative levels at 6 months postoperatively. Trefoil (Z33) is the exclusive Zenike pattern to increase significantly following CK, peaking at 3 months and then decreasing back to near preoperative level at 6 months after CK. In the hyperopic LASIK group, coma increased to a peak at 3 month postoperatively, and persisted at sixth month after LASIK. Spherical aberration decreased significantly at 3 months and persisted till the sixth postoperative month. There was significant correlation between ΔSE and Δspherical aberration showed in both groups. The HOA and main Zernike polynomials pattern and their natural changes induced by CK is significantly different from that induced by LASIK in the hyperopic corrected treatment. The amount of achieved hyperopic corrections induced by CK or LASIK is not correlated to the change of HOA patterns such as coma and trefoil, but it is correlated to the change of spherical aberration.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 年龄范围
- 40 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •age of over 40 years old (yrs)
- •stable refraction
- •planned to induce a myopic shift
排除标准
- •age of less than 40 years old (yrs)
- •significant systemic illnesses
- •congenital myopia,
- •media opacity uveitis
- •intraocular surgery refractive surgery
- •neurologic diseases
- •retinal disease
结局指标
主要结局
uncorrected visual acuity
时间窗: change from baseline with EDTRS chart at 6 months
uncorrected visual acuity change from baseline at 6 months
best spectacle-corrected visual acuity
时间窗: change from baseline with EDTRS chart at 6 months
best spectacle-corrected visual acuity change from baseline with EDTRS chart at 6 months
次要结局
- near vision(change from baseline with EDTRS chart at 6 months)
- central and peripheral corneal ultrasound pachymetry(change from baseline with EDTRS chart at 6 months)
研究者
Wang Hongxia
Shanghai Guanghua Hospital of Integrated Traditional Chinese and Western Medicine
Shanghai Guanghua Hospital of Integrated Traditional Chinese and Western Medicine