How big is the foveal avascular zone?
It is an important landmark in Fluorescein angiography. Its diameter is 0.5mm, the central 1.5 degrees of an individual’s Visual field.
What is the approximate diameter of the foveal avascular zone?
In sections, the foveal avascular zone was approximately 500 μm in diameter at 35 weeks’ gestation and 300 to 350 μm at 40 weeks’ gestation; in whole mounts, it was 150 to 170 μm in diameter at 37 and 41 weeks’ gestation.
Is foveal avascular?
The absence of blood vessels and overlaying inner retinal tissue are thought to maximize the optical quality of the fovea pit by reducing light scattering. This central avascular region is known as the foveal avascular zone (FAZ).
What is the foveal avascular zone?
The foveal avascular zone (FAZ) is a region surrounding the fovea which is devoid of retinal capillaries. The role of the FAZ in vision has been investigated extensively, and it has been found that the size of the FAZ was closely related to vision and can be measured with good repeatability and reproducibility by FA8.
How does OCTA work?
OCTA works by detection of erythrocyte motion, so any extraneous movement during the image-capturing process may result in motion artifacts, which appear as white or black lines in the flow angiograms, and/or misalignment of the retinal vasculature.
What is the posterior pole of the retina?
Posterior Pole: The posterior pole in the back portion of the retina and includes the optic nerve and macula. Optic Nerve Head: The optic nerve head is the face of the optic nerve as it enters the back of the eye. It is made of millions of nerve fibers and transmits visual information to the brain for processing.
What is foveal reflex?
The foveal reflex is a bright pinpoint of light that is observed to move sideways or up and down in response to movement of the opthalmoscope. [ from HPO]
What is the difference between OCT and OCTA?
The important difference between OCT and OCTA is: OCT images anatomical structure, OCTA images vascular structure. A large amount of burden is placed on the imager-usually technicians-because the amount of data captured in a scan is more than the clinician, or interpreter of the images, can feasibly decipher.
What is an SD OCT?
Spectral Domain Optical Coherence Tomography (SD-OCT) The OCT is rapid and non-intrusive. There’s no pupil dilation or discomfort. You simply lean into the instrument and look at a visually comfortable light. The OCT provides precision data to assist your doctor in determining if you have glaucoma.