Cup-to-Disc Ratio for Glaucoma Risk Assessment

Calculates the cup-to-disc ratio (CDR) from optic nerve head measurements. Normal CDR <0.6; suspicious >0.6–0.7; high glaucoma risk >0.8. Asymmetry ≥0.2 between eyes is also a red flag. Used alongside IOP and visual field testing for glaucoma assessment.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculates the cup-to-disc ratio (CDR) from optic nerve head measurements. Normal CDR <0.6; suspicious >0.6–0.7; high glaucoma risk >0.8. Asymmetry ≥0.2 between eyes is also a red flag. Used alongside IOP and visual field testing for glaucoma assessment

Each component has a specific meaning:

  • Optic nerve head measurements — The optic nerve head measurements recorded for the scenario being assessed.

Note: Interpret the cup-to-disc ratio result against the thresholds and context described above.

How to Use

Enter the optic nerve head measurements for the scenario you are assessing. Calculates the cup-to-disc ratio (CDR) from optic nerve head measurements. Normal CDR <0.6; suspicious >0.6–0.7; high glaucoma risk >0.8. Asymmetry ≥0.2 between eyes is also a red flag. Used alongside IOP and visual field testing for glaucoma assessment. Use the cup-to-disc ratio result to inform your calculation.

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Frequently Asked Questions