Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
How does an OCT work? |
OCT uses an interferometerthat measures the time it takes for light to be reflected back from the structures in the retina as compared to the time it takes for light to be reflected back from a reference miror at specific distance |
|
The line scan simply scans in a single straight |
The length of the line can be changed as well as the scan angle |
|
When measuring retinal thickness what area of the retina is being measured? |
The nerve fiber layer in the retinal pigment epithelium. The distance between those two layers was what is measured to represent retinal thickness |
|
For purpose of analysis the OCT image of the retina can be subdivided vertically into four regions |
The pre-retina, that epi-retina, The intra-retina, and the sub retina, |
|
The OCT retinal form and structure can be subdivided into for profiles. Each profile has its own set of deformations and anomalous structures |
Preretinal profile, overall retinal profile, foveal profile, macular profile |
|
What are some anomalous structures that can be observed in the preretinal profile? |
Pre-retinal membrane, epiretinal membrane, vitreoretinal strands, vitreoretinal traction, pre- retinal neo vascular membrane, pre-papillary neovascular membrane. |
|
What anomalies can be diagnosed and treated without flouredcein angiography? |
Macular cyst and holes, and diabetic maculopathy |
|
What is the FDA's regulation on how long to scan an eye? |
No more than 10 minutes |
|
The Zeiss OCT allowswhat type of analysis of the retina |
Qualitative, and quantitative analysis |
|
Qualitative analysis is? |
Describes our identifies morphological changes and Anapolis structures in the retina |
|
Quantitative analysis involves? |
Measurements of the retina, specifically retinal thickness and Valium and nerve fiber layer thickness |
|
What is normal RNFL thickness in Microns? |
80 microns, sickness from 60 to 70 microns implies glaucoma |
|
Raster scan is performed because |
Entire posterior pole is observed |