The Picture Behind Your Eyes

Follow light through a working eye model. Investigate focus, underwater blur, glasses, pupils, colour and the signals that make seeing possible. Nine investigations for ages 12 and up, using visible comparisons to explain what changes.

Library

Making the picture

Lesson 1

Where Does the Tip Go?

Light from a tree reaches the back of your eye. Which way up is the tree’s picture there?

Start

Lesson 2

Blurry Under Water

Clear water, healthy eyes, and still the whole pool turns to a blur.

Start

Lesson 3

The Book and the Mountain

The page and the mountain are both sharp, just never at the same moment.

Start

When the picture blurs

Lesson 4

Sharp Up Close, Blurry Across the Room

The page is perfectly sharp, yet the board across the same room is a blur.

Start

Lesson 5

She Passed the Eye Test

A student sees the classroom board clearly, but reading makes her eyes tired. How could keeping things clear be part of the effort?

Start

Lesson 6

Whose Glasses Are These?

Two people try the same glasses. One sees more clearly; the other sees a blur. How can the same lenses help one eye and hinder another?

Start

From light to seeing

Lesson 7

The Black Dot That Breathes

Less light gets into the eye, yet its picture becomes clearer. How can that help?

Start

Lesson 8

Grey at Midnight

At midnight you can still find your way round the garden, but every flower has turned grey.

Start

Lesson 9

The Picture That Disappeared

A clear picture forms inside the eye, yet the person cannot see it. What could be missing?

Start

Review and assessment

Lesson 10

Test: The Picture Behind Your Eyes

Review the course ideas by applying them to new situations, with kind feedback after every answer.

Locked till you take the prior lesson