Optical Coherence Tomography in Macular Disorders
نویسندگان
چکیده
In ultrasound, a high frequency sound wave is launched into the eye with the help of a probe and the sound wave is reflected from different boundaries between microstructures. However, the OCT uses light rather than ultrasound. The speed of the light is almost a million times faster than sound and this difference allows the measurement of structures with resolution of =10 μ compared to 100μ scale for ultrasound. Secondly OCT does not require contact like the ultrasound.
منابع مشابه
Clinical Applications of Optical Coherence Tomography in Ophthalmology
Assessment of the peripapillary nerve fiber layer and macular thickness can be determined in ophthalmology using optical coherence tomography (OCT). Decreased nerve fiber layer thickness and macular ganglion cell thickness in optic nerve ischemia have been correlated with visual field loss. OCT allows deep optic nerve head evaluation which helps understand pathophysiology of diseases. Furtherm...
متن کاملRetinal Ganglion Cell Complex in Alzheimer Disease: Comparing Ganglion Cell Complex and Central Macular Thickness in Alzheimer Disease and Healthy Subjects Using Spectral Domain-Optical Coherence Tomography
Introduction: Alzheimer disease (AD) is the most common form of dementia worldwide. The modalities to diagnose AD are generally expensive and limited. Both the central nervous system (CNS) and the retina are derived from the cranial neural crest; therefore, changes in retinal layers may reflect changes in the CNS tissue. Optical coherence tomography (OCT) machine can show delicate retinal layer...
متن کاملCorrelation between Visual Acuity and Optical Coherence Tomography-Measured Retinal Thickness in Diabetic Macular Edema
Background and Objective: Diabetic macular edema (DME) is one of the common complications of diabetes which significantly accounts for preventable visual impairment and blindness. Central macular thickness (CMT) is a feature found in DME patients. This study aims to determine the relationship between optical coherence tomography (OCT)-measured CMT and visual acuity (VA) in patients with DME bef...
متن کاملبررسی پایایی و تکرار پذیری دستگاه Spectral domain optical coherence tomography در اندازه گیری ضخامت ماکولا در چشمهای طبیعی قبل و بعد از گشاد کردن مردمک
Background: optical coherence tomography is one of the most valuable imaging techniques in the evaluation of macula. Objective: to investigate the repeatability and reproducibility of OCT in measuring the macular thickness in normal eyes before and after pupil dilation. Methods: A total of 44 eyes were enrolled. All subjects underwent macular thickness measurement using the Cirrus SD-OCT ma...
متن کاملمروری بر درمانهای دارویی ادم سیستوئید ماکولای سودوفیکیک
Background: To present an overview of the pharmacologic treatment of pseudophakic macular edema. Methods: A systematic review of the currently accepted pharmacologic treatments for pseudophakic macular edema. Main outcome parameters include visual acuity and central macular thickness as determined by ocular coherence tomography. Articles retrieved by Pubmed search using keywords pseudophaki...
متن کاملEvaluation of Optical Coherence Tomography Angiography Findings in Patients with Branch Retinal Vein Occlusion
Purpose: To analyze the correlation of optical coherence tomography angiography (OCTA) findings with visual acuity (VA) in patients with branch retinal vein occlusion (BRVO). Methods: This cross-sectional study was performed on 20 eyes of 20 patients with unilateral BRVO involving the macula referred to the ophthalmology clinic of Rassoul Akram Hospital. OCTA imaging was conducted for all patie...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2011