Optometry Continuing Education

OCT Mastery - Tip of the Week

New OCT Mastery tips are added each week. Subscribe to get them in your inbox.

83. The Turtle Sign

A 54-year-old with rheumatoid arthritis and visual loss:

Tip #82


Here the inner retinal layers are well within normal limits. The outer left and right of the image show an intact retina. The middle third of the image shows RPE elevation centrally and atrophy in the immediate peri-foveal area. With this atrophy, there is shadowing present. Because there is a loss of RPE in the area immediately surrounding the fovea, the outer nuclear layer (black) appears somewhat elevated. It sort of looks like a small turtle. So we can call this the “turtle” sign. This patient had signs of chloroquine retinopathy and had a “bull's eye” picture of atrophy.

Tip #78 - Labelled


If you see the “turtle” sign, toxic causes need to be ruled out.

Not receiving our tips yet? Subscribe to receive them straight to your inbox.


Continue to your Optocase account.

Reset Password

Enter email to receive a new password.

Join Optocase

Setup a free account to join Optocase now.