Participants receive one-click autofocus examination first, followed by segmented focus examination. Both examinations are performed during the same endoscopic session. The order of the two techniques is randomized.

Participants receive segmented focus examination first, followed by one-click autofocus examination. Both examinations are performed during the same endoscopic session. The order of the two techniques is randomized.

Magnifying endoscopy examination performed using the one-click autofocus mode. The system automatically adjusts focus to the optimal plane with a single button press.

Image quality is objectively quantified using edge detection analysis applied to standardized images captured by each technique. The standard deviation of pixel intensity after edge detection processing is used as the quantitative metric. A higher standard deviation indicates higher image contrast and edge definition, reflecting superior image quality. All image analyses are performed offline by an independent researcher blinded to the technique used.

Image quality is subjectively assessed by two to three independent expert reviewers blinded to the technique used. Recorded videos of magnifying endoscopy examinations are reviewed offline and scored using a 5-point Likert scale, where 1 = poor and 5 = excellent. Higher scores indicate superior image quality. The final score for each image is the average of the reviewers' scores.