Pharmacological mydriasis and optic disc examination

Area of Science:

• Ophthalmology
• Glaucoma Research
• Clinical Measurement

Background:

• Accurate optic disc assessment is vital for glaucoma diagnosis and monitoring.
• Interobserver variability in optic disc measurements can impact clinical decisions.

Purpose of the Study:

• To evaluate the impact of pharmacological mydriasis on the interobserver agreement of optic disc measurements.
• To compare the reproducibility of optic disc and cup/disc ratio measurements with and without mydriasis.

Main Methods:

• A cross-sectional study involving two observer pairs examining optic disc parameters.
• Patients were randomized into groups examined with and without mydriasis.
• Horizontal and vertical disc diameters and cup/disc ratios were measured using a 78 diopter lens.

Main Results:

• Examination after mydriasis demonstrated significantly greater interobserver agreement for cup/disc ratios compared to examination without mydriasis.
• The 95% limits of agreement for cup/disc ratio differences were substantially larger without mydriasis (p<0.001).
• Mydriasis improved the percentage of cases with good agreement (≤0.1 difference) for vertical and horizontal cup/disc ratios from 72-76% to 95-97%.

Conclusions:

• Optic disc examination without pharmacological mydriasis results in significantly poorer interobserver agreement.
• Mydriasis is essential for achieving reproducible clinical examinations in glaucoma management.
• The study highlights the importance of mydriasis for reliable glaucoma assessment and monitoring.