相关实验视频

Updated: Jul 4, 2025

$Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity$

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity

Published on: September 20, 2024

在皮质透镜磨损后,异常变化发生在眼睛中,有透明边缘变性

Ronit Dutta¹, Geetha Iyer², Bhaskar Srinivasan²

¹Department of Contact Lens, Sankara Nethralaya, Unit of Medical Research Foundation, Chennai, Tamil Nadu, India.

Indian journal of ophthalmology

|February 7, 2024

概括

膜透镜 (SLs) 显著改善视力,并减少具有透视边缘退行症 (PMD) 的眼睛中的更高阶异常 (HOA). 这些镜头增强了纠正距离视觉敏度 (CDVA) 和对比度敏感度 (CS),提供了有效的视觉校正选项.

科学领域:

眼科医生眼科眼科
视光学测量视光学测量视光学测量
角膜疾病角膜疾病

背景情况:

皮质边缘退行症 (PMD) 是一种渐进的角膜稀释障碍.
PMD往往导致不规则的白和显著的视力障碍.
标准的折射校正对于PMD患者来说往往是不够的.

研究的目的:

评估膜透镜 (SLs) 在管理PMD相关的视觉障碍方面的有效性.
量化SLs对高阶偏差 (HOA),纠正距离视敏度 (CDVA) 和PMD眼睛对比度敏感度 (CS) 的影响.

主要方法:

在诊断出PMD的24只眼睛上安装了膜透镜 (SL).
测量CDVA,CS和HOA是在基线和SL磨损后进行的.
使用i-Trace异常计进行HOA评估.

主要成果:

SL磨损导致CDVA (P < 0.001) 和CS (P < 0.001) 的统计学显著改善.
观察到总HOA (HO-RMS,P < 0.001),昏迷 (P < 0.001),二次纹 (P = 0.007) 和三叶草 (P < 0.001) 的显著减少.
RMS球形偏差没有显示出统计学上显著的变化 (P = 0.37).

结论:

膜透镜是纠正PMD视力缺陷的有效方式.
SLs显著降低了高阶异常,从而提高了PMD患者的视觉表现.
SLs提供了一个有前途的治疗方案,以改善视力,在个体有透明边缘退行性变性.

更多相关视频

Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents

Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents

Published on: February 15, 2022

Scleral Cross-linking Using Riboflavin and Ultraviolet-A Radiation for Prevention of Axial Myopia in a Rabbit Model

Scleral Cross-linking Using Riboflavin and Ultraviolet-A Radiation for Prevention of Axial Myopia in a Rabbit Model

Published on: April 3, 2016

相关概念视频

Focusing of Light in the Eye

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

Glaucoma: Overview

Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...

Angle Closure Glaucoma: Treatment

Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...

Photoreceptors and Visual Pathways

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...