What is the most common error made in contact biometry?

The most common error made in contact biometry is corneal compression. This phenomenon occurs when the ultrasound probe makes contact with the cornea during measurement, leading to flattening or alteration of the corneal shape. As the probe presses against the cornea, it can change the anterior chamber depth and other ocular parameters that are critical for accurate biometry. If not accounted for, this compression can result in significant errors in the measurement of intraocular structures, affecting the calculation of intraocular lens power for cataract surgery or other refractive procedures.

In contrast, while inadequate patient positioning, incorrect equipment calibration, and misinterpretation of data can also lead to errors in biometry, they are not as prevalent as corneal compression. Proper patient positioning is essential but tends to be less frequently the primary source of error in biometry. Similarly, calibration issues may arise, but equipment used in clinical settings is often well-maintained and calibrated regularly. Lastly, misinterpretation of data can occur, but most technicians are trained to analyze the biometry results carefully, reducing the likelihood of this leading to significant error. Therefore, corneal compression stands out as the most common and critical error in contact biometry.