Cup-to-Disc Ratio and Glaucoma Risk Assessment

Calculates cup-to-disc ratio (CDR) from optic disc and cup measurements, assesses glaucoma risk based on asymmetry, neuroretinal rim thinning, and ISNT rule compliance.

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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 cup-to-disc ratio (CDR) from optic disc and cup measurements, assesses glaucoma risk based on asymmetry, neuroretinal rim thinning, and ISNT rule compliance

Each component has a specific meaning:

  • Optic disc — The optic disc recorded for the patient or scenario being assessed.
  • Cup measurements — The cup measurements recorded for the patient or scenario being assessed.
  • Assesses glaucoma risk based on asymmetry — The assesses glaucoma risk based on asymmetry recorded for the patient or scenario being assessed.
  • Neuroretinal rim thinning — The neuroretinal rim thinning recorded for the patient or scenario being assessed.
  • ISNT rule compliance — The isnt rule compliance recorded for the patient or scenario being assessed.

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

How to Use

Enter the optic disc, cup measurements, assesses glaucoma risk based on asymmetry, neuroretinal rim thinning, ISNT rule compliance for the patient or scenario you are assessing. Calculates cup-to-disc ratio (CDR) from optic disc and cup measurements, assesses glaucoma risk based on asymmetry, neuroretinal rim thinning, and ISNT rule compliance. Use the cup-disc ratio result to inform your clinical assessment.

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Frequently Asked Questions