Your student constructs a working eye model from a clear 500 mL bottle filled with water, a small plastic cup serving as the lens, plastic wrap, black construction paper, and a strip of white paper as the retina. The lab sheet walks through an eight-step procedure and then asks four observation questions, including whether the image on the retina appears right-side up or upside down and what changes when the lens moves closer or farther. It suits grades 3 to 6 and connects directly to life science standards covering light, optics, and sensory systems.

Building a model of the human eye works as a standalone lesson or as the hands-on anchor of a unit study on the senses, light and optics, or human biology. The Think and Explain section pushes your homeschooler past observation into reasoning, asking them to name which bottle part represents the cornea, the pupil, the lens, and the retina. A fun fact panel about lens accommodation gives an easy extension discussion for older students, and the background paragraph gives younger students enough context to understand the camera analogy before they build anything.