Eye Structure 2.0 | LKS Science

PART 01

Give every part a place.

Select a part, then tap its numbered position. A location clue helps you decide.

Eye cutaway · front at the left0 / 8 placed

Choose a part to begin.

The pupil is the opening in the iris, not a separate piece. Other tissues and fluids are omitted from this simplified model.

PART 02

Two changes. Two different responses.

Investigate brightness first, then move the glowing object nearer or farther away.

Light → cornea → pupil → lens → retinaLight off

Pupil—

Lens—

FocusOn the retina

01 / Pupil reflex

Bright light → iris makes the pupil smaller. Dim light → pupil becomes larger. This controls how much light enters.

02 / Accommodation

Near object → ciliary muscles contract, suspensory ligaments slacken, lens becomes thicker. Far object → muscles relax, ligaments tighten, lens becomes thinner.

03 / Seeing

The cornea and lens refract light. An inverted image forms on the retina. Light-sensitive cells produce nerve impulses that travel along the optic nerve to the brain.

Ray paths and distances are schematic. The diagram follows light from one point of the object; it does not draw the full inverted image. The cornea and lens are represented as a combined focusing system near the lens.

PART 03

What does each structure do?

Eight questions, instant explanations, and a review of anything to practise.

Use the highlighted structure as a clue

PART 04

Bring the focus back.

Compare the focus for a distant object. Choose a spectacle lens and watch what changes.

Distant object · parallel incoming rays

Light rays │ Retina ● Focus

Quick check

Which lens corrects short sight?

Simplified comparison with accommodation relaxed. A young eye may compensate for some long sight by accommodation. Dashed rays behind the retina show where the light would focus if the retina were not in the way.