Play YouTube videos on your Android Wear smartwatch. Search videos and view your subscribed channels. Cast videos from your watch to your TV with Chromecast.
I sometimes sit closer to small screens on tablets, handheld consoles, smartphones, and smaller screen laptops which make the video easier to watch.
I bet, holding this smartwatch closer to your face, would make the screen look bigger.
I think some types of video like a video of a clock's face, moving animated eye ball, moving mouth and spinning wheel would be good for this smartwatch, but more detailed video like a video gameplay and movie trailers would be less enjoyable.
People used to play games, view videos and watch video on a Tamagotchi with small screens, small MP3 players with a colored screen, and older cell phones which screen is about the size of this Smartwatch's screen. I think as long as the screen or room is bright enough, and the screen resolution is higher, eye strain will be less of a problem unless you watch longer video.
I saw a news report which says eye strain from TV is caused by dry eyes from people not blinking their eyes enough when they watch TV, smartphone, or monitors because they are too focus on the video to blink regularly.
If a person eyes get strained while reading smaller text, and watching video and viewing pictures on a smaller screen, it is a good time to visit the eye doctor for him to prescribe the person a pair of vision correcting glasses, contact lenses, or refer you to the hospital to fix more serious vision problems like cataracts/cloudy eyes.