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Holding a high power lens properly during measurement is crucial to prevent inaccurate measurements. High power lenses have a very short focal length, which means even slight errors in positioning can lead to significant discrepancies in the measurements taken. If the lens is not held correctly, the axis may not align with the intended meridian, resulting in the wrong calculations for optical centers and prescription parameters. This lack of precision can adversely affect patient outcomes, as the lens may not provide the intended vision correction.

In addition to preventing inaccuracies, proper handling also minimizes distortion and can contribute to ease of handling; however, these factors primarily support the ultimate goal of maintaining measurement accuracy. Thus, ensuring the correct positioning of the lens directly influences the reliability of the results obtained, which is why it is emphasized as a critical practice in ophthalmic measurement.