Phosphenogram

Browser-based phosphene drawing and reconstruction tool. Draw phosphenes, customise the display, upload a still image, animated gif or short video as background, and save local PNG/CSV output with cooridnates and size calculations without installing Python. Using the plot option, you can reconstruct and add the automated measurments by uploading the saved CSV. Given the ability to modify the background of the drawing window, this tool can also be used to record and assess the visual experience of patients with neuro-ophtalmological disorders e.g., Visual Snow Syndrome or Charles Bonnet.

Canvas and display settings

Pixel values change the digital drawing window size; users should independently measure and enter the physical drawing area in mm and the viewing distance in cm for accurate calculations.

Canvas width (px)

Canvas height (px)

Physical width (mm)

Physical height (mm)

Viewing distance (cm)

Brush size (px)

Study metadata

Participant / file prefix

Session

Condition

Background

Background colour

Background image opacity

1.00

Upload background image, gif, or video

Still images, animated gif files, and short video files are supported. Videos loop automatically. If you save a PNG, the export captures the frame visible at the moment of saving.

For flashing or moving lattice stimuli, screen participants for photosensitivity, seizure disorders and use an appropriate ethics approved protocol.

Drawing and guide lines

Stroke colour

Stroke opacity

1.00

Quadrant line colour

Quadrant line opacity

0.75

Quadrant line width, px

Show quadrant lines

CSV reconstruction

Label mode for loaded CSV

Recommended workflow: set the parameters first, then click Apply settings + start fullscreen drawing. Controls: draw with mouse, trackpad, stylus, or touch. Press S to save PNG+CSV, C to clear, Z to undo, and Esc to leave fullscreen.

Ready. Strokes: 0