Slit Lamp Simulator

Eye

Examiner’s view: right eye on your left, left eye on your right.

Fixation

Changes where the patient is fixating. This shifts the base position of the aerial image, so the same hand movements sample different retinal regions.

Lens presets

These adjust the simulated field of view and how “fast” the retina moves for a given relative movement between lens and slit lamp.

Keyboard controls

OD (examining right eye):
• WASD = handheld lens (left hand)
• Arrow keys = slit lamp joystick (right hand)

OS (examining left eye):
• WASD = slit lamp joystick (left hand)
• Arrow keys = handheld lens (right hand)

The field you see depends on the relative position of lens and slit lamp. If you move them together in the same direction, the image stays still.

Retina image

By default the built-in ultrawidefield right-eye image is used (mirrored for OS). If you upload your own image, please use a right-eye photo; selecting OS will mirror it automatically.

How to practise

• Select OD or OS and a lens type.
• Use WASD and the arrow keys together to simulate moving lens and joystick at the same time.
• Click and drag vertically on the main view to adjust Z‑axis focus (drag down = pull back = sharper).
• Notice that if you move both in the same direction by a similar amount, the field hardly moves.
• Use the small upright retina window to understand which anatomical area you are sampling.
• Change fixation and repeat the same movements to see how the sampled area shifts.