👦 Outdoor Time & Myopia Progression Simulator

Bright Outdoor Light Exposure

Outdoor light is orders of magnitude brighter than indoor light.

• 10,000+: Outdoor lux (Typical daylight, short placeholder)
• ~500: Indoor lux (Typical classroom, placeholder)
• ~2 hrs/day: Protective threshold (Commonly cited target)
• Moderate: Effect size (Placeholder summary value)

Why light intensity matters

Bright light exposure is the key driver, placeholder text only.

Retinal Dopamine Release Mechanism

Light exposure stimulates retinal dopaminergic amacrine cells.

• Dopamine: Signal type (Retinal neurotransmitter)
• Bright light: Trigger (Placeholder mechanism note)
• Amacrine cells: Pathway (Placeholder retinal layer)
• Minutes: Response time (Placeholder estimate)

Dopamine as a stop signal

Dopamine release scales with light dose, placeholder text only.

Eye Elongation Inhibition Effect

Dopamine signaling slows abnormal axial eye growth.

• Sclera: Target tissue (Placeholder eye structure)
• Axial length: Growth measure (Placeholder metric)
• Reduced: Inhibition effect (Placeholder direction)
• Higher, younger: Age sensitivity (Placeholder note)

Axial length and refractive error

Slower elongation limits myopic shift, placeholder text only.

Indoor Time Myopia Risk Contrast

More indoor near-work time associates with faster progression.

• Elevated: Indoor risk (Placeholder comparison)
• High: Near-work hours (Placeholder typical value)
• +0.3 D/yr: Progression delta (Placeholder estimate)
• Contributing: Screen time link (Placeholder factor)

Indoor versus outdoor contrast

Indoor-heavy schedules raise progression risk, placeholder text.

Recommended Daily Outdoor Time Target

Public health guidance suggests a daily outdoor time target.

• 2 hrs/day: Recommended time (Commonly cited guideline)
• Recess-based: School programs (Placeholder intervention)
• Meaningful: Population impact (Placeholder summary)
• 5–14 yrs: Age range (Placeholder target group)

Turning evidence into guidance

Two outdoor hours daily is a practical target, placeholder text.

Short placeholder callout: consistent daily outdoor time helps most.