Figure 1. A view of the retina seen through an ophthalmoscope. In the center of the retina is the optic nerve, a circular to oval white area measuring about 2 x 1.5 mm across. From the center of the optic nerve radiate the major blood vessels of the retina.
A virtual classroom is an online classroom that allows participants to communicate with one another, view presentations or videos, interact with other participants, and engage with resources in work groups. Non-Restricting.
Google Classroom. Google Classroom is a blended learning platform developed by Google for schools that aims to simplify creating, distributing and grading assignments in a paperless way. It was introduced as a feature of G Suite for Education on May 6, 2014, followed by its public release on August 12, 2014.