Related Experiment Video
Updated: Jan 23, 2026

Evaluation of Capillary and Other Vessel Contribution to Macular Perfusion Density Measured with Optical Coherence Tomography Angiography
Published on: February 18, 2022
Microvascular change in acute macular neuroretinopathy by using optical coherence tomography angiography
Yen-Chih Chen1, San-Ni Chen1,2
1Department of Ophthalmology, Changhua Christian Hospital, Changhua City, Taiwan.
Abstract:
A 27-year-old pregnant female underwent cesarean section due to preeclampsia. Two days after the delivery, she presented with acute onset of blurred vision in the left eye. Optical coherence tomography (OCT) revealed characteristic findings of acute macular neuroretinopathy (AMN) in both eyes. During the follow-up, her vision improved gradually, but outer nuclear layer thinning with disruption of ellipsoid zone was identified from OCT. OCT angiography was arranged and revealed both vascular defect in superficial and deep vascular plexus, which correlated with previous AMN lesions in both eyes. Subsequent microvascular change in AMN was found to involve both superficial and deep vascular plexus, which is different from the current consensus that AMN mainly involved deep vascular plexus. By using the OCT angiography, we can better visualize the detail retinal vascular structure and may identify the real mechanism in this rare retinal disorder.
Related Concept Videos
Global Climate Change
Work Done During Volume Change
Consider a gas confined to a cylinder fitted with a movable piston at one end. If the gas expands from volume V1 to volume V2, it exerts a force on the piston, such that the piston moves by a distance dr.
The work done by the gas on the piston can be expressed as
Net Change Theorem
Standard Entropy Change for a Reaction
Le Chatelier's Principle: Changing Temperature
To understand this phenomenon, consider the elementary reaction:
Application of Rates of Change

