👦 Axial Eye Elongation Simulator

The Normal Emmetropic Eye

A healthy eye matches its length to its optical power.

• 23-24mm: Typical axial length (placeholder reference range)
• ~0 D: Refractive state (placeholder emmetropia)
• at focus: Retina position (placeholder alignment)
• birth+: Onset age (placeholder growth window)

Emmetropization

Eye growth normally self-calibrates focus onto the retina.

Progressive Axial Elongation

Excess axial growth stretches the globe beyond normal limits.

• 24-26mm: Myopic range (placeholder progression band)
• near work: Growth driver (placeholder risk factor)
• 6-16 yrs: Typical age (placeholder onset window)
• 0.1-0.4mm: Annual growth (placeholder yearly rate)

Scleral stretching

The posterior sclera thins and stretches over time.

Focal Point Anterior to Retina

Light rays cross to a point before reaching the retina.

• myopic: Defocus type (placeholder optical term)
• ~2.5 D: Shift per mm (placeholder diopter rule)
• minus lens: Correction (placeholder optical fix)
• blur far: Symptom (placeholder complaint)

Ray convergence

Rays converge early then diverge before hitting the retina.

Blurred Distance Vision

A defocused blur circle replaces a sharp retinal image.

• grows w/ D: Blur circle (placeholder size rule)
• often clear: Near vision (placeholder contrast)
• reduced acuity: Far vision (placeholder symptom)
• glasses/CL: Fix (placeholder correction)

Retinal image quality

Blur circle size scales with how far focus misses the retina.

Elongation Rate as a Progression Marker

Faster yearly elongation predicts higher long-term myopia risk.

• >0.25mm/yr: Fast progressor (placeholder threshold)
• <0.10mm/yr: Slow progressor (placeholder threshold)
• 6-12 yrs: Peak risk age (placeholder window)
• biometry: Monitoring tool (placeholder method)

Tracking growth

Repeated axial length measurements reveal the progression trend.