🔷 Corneal Topography Mapping Simulator

Reading a Normal Corneal Topography Map

A placeholder sentence: normal maps show smooth, mild, symmetric power gradients.

• 43.5 D: Mean central K (Placeholder normal value)
• <0.75 D: Cyl (astigmatism) (Placeholder normal range)
• Low: Symmetry index (Placeholder metric)
• ~0: Inferior-sup asymmetry (Placeholder metric)

What a normal map looks like

Placeholder: colors shift gently from center to edge with no hot spots.

Why mild symmetry is expected

Placeholder: slight natural toricity is common and not pathologic.

The Bowtie Signature of Regular Astigmatism

Placeholder sentence: a symmetric bowtie marks regular, correctable astigmatism.

• High: Bowtie symmetry (Placeholder metric)
• ~90°: Lobe axis (Placeholder orientation)
• 1–3 D: Cyl power (Placeholder range)
• Low: Cone risk (Placeholder assessment)

Two-lobe pattern basics

Placeholder: opposing steep lobes sit along one meridian axis.

Why symmetry matters here

Placeholder: equal lobes mean the astigmatism is regular and stable.

Asymmetric Bowtie — An Irregularity Red Flag

Placeholder sentence: unequal lobe sizes suggest irregular astigmatism.

• Reduced: Bowtie symmetry (Placeholder metric)
• Uneven: Lobe size ratio (Placeholder metric)
• Uncertain: Cyl stability (Placeholder assessment)
• Watch: Cone risk (Placeholder assessment)

Spotting lobe asymmetry

Placeholder: one lobe visibly larger or hotter than its pair.

Why this needs attention

Placeholder: asymmetry can precede progressive corneal disease.

Inferior Steepening — The Classic Early Cone Signature

Placeholder sentence: a focal inferior hot zone is a hallmark early sign.

• High: Steepening degree (Placeholder metric)
• Inferior: Hot zone location (Placeholder location)
• >52 D: Peak power (Placeholder threshold)
• Elevated: Cone risk (Placeholder assessment)

Locating the hot zone

Placeholder: red/orange island appears below the visual center.

Why inferior matters most

Placeholder: inferior steepening is the classic early-cone location.

Combining Symmetry and Steepening Into a Reading

Placeholder sentence: the final call blends both pattern signatures together.

• 2: Decision inputs (Placeholder: symmetry + steepening)
• 4: Outcome classes (Placeholder count)
• High values: Referral trigger (Placeholder rule)
• Low values: Routine trigger (Placeholder rule)

Reading the combined signature

Placeholder: cross symmetry and steepening sliders to classify.

Turning pattern into action

Placeholder: high scores on either axis shorten follow-up interval.