Hello everyone. i am workin g on retinal identifcation. All of the online available Fundus image database are captured using field of view of 45 degree.
Is there any specific resaon for having this field of view???
45 degrees is the standard "middle" field of view on most commercially available mydriatic and non-mydriatic fundus cameras. It allows for a balance of good magnification of landmarks with area of retinal coverage per image. It also tends to be the sharpest of magnifications due to the design of a variable angle camera. For all of these reasons, most clinical trials/reading centers specify 40-45 degrees as the magnification of choice. That being said, many also require several images, including Modified Seven Standard Fields, to provide wider coverage of the retina, especially if the disease being evaluated affects the periphery.
sir,
A typical camera has a field of view (FOV) of 30 to 50 degrees with a magnification of 2.5x. The images were acquired using a Canon CR5 non-mydriatic 3CCD camera with a 45 degree field of view (FOV). Each image was captured using 8 bits per color plane at 768 by 584 pixels.
The widespread utlization of 45 degrees FOV is linked to the fact that the standard protocol for assessing diabetic retinopathy is (still) the ETDRS ( Early Treatment Diabetic Retinopathy Study), which requires 7 field at 45 degrees.
- Badges
- Science topic
- Similar topics
- Computer Science
- Images