Hip Hop Harry sings about the importance of eyes and how glasses can assist those with poor vision.

It all starts when Billy Dog realizes that he is having trouble seeing things that are far away. He takes a trip to the eye doctor to have an eye exam, and he gets his first pair of glasses. At first, he was apprehensive and resistant to getting glasses, but afterwards he realizes all the benefits they have!

Beakman explains how vision works involving the brain and eyes. He then explains how this works to create optical illusions.

After smoking tobacco for quite some time, the gang (Robin, Lily, Ted, Marshall, and Barney) starts to have health issues. Lily's voice becomes hoarse, Ted is easily fatigued due to the reduced flow of oxygen in his blood stream, and Arthur Hobbs, in an extreme situation, has a heart attack.

Vivian gets measured for her first bra.