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建议您最好使用2.5米的视力检测距离

超级视力表APP在检测视力的方式上，给予了用户很大的自由空间，提供了2.5m，2m和50cm三种选项。50cm的检测距离意味着，用户无需他人帮助，也能单手完成全部的视力检测操作。

然而在实际检测的过程中，我们建议您最好选择2.5m作为检测距离，并在他们的帮助下完成整个测量过程。这是因为，50cm只是一个预估的成年人手臂长度，不同的测量者可能有很大的差距。当选择50cm作为检测距离时，哪怕只是距离的估计上差了1cm，也会对检测结果带来2%的最终误差。

然而当检测距离设置为2.5m时，1cm的误差对检测结果的影响只有0.4%，极大地提升了测量结果的准确性。

另外需要请您注意的是，超级视力表APP是基于对数视力表国标进行研发的，在使用过程中测量的准确性与标准的纸质视力表完全一致。然而在实际使用过程中，用户对于检测距离的估计总是或多或少有些偏差，从而导致测量误差。

对于这一点，超级视力表APP最关注的其实并不是测量结果的绝对准确性，而且每一次测量结果之间的相对准确性，确切地来说，就是整体的视力变化趋势的准确性，这也正是我们最希望用户关注的点。所以，只要您可以确保每一次检测，都是在大致相同的距离间完成的，那么便可以保证视力变化趋势是准确的。

系统会将您每一次的测量结果进行记录，并绘制成一张折线图，帮助您及时发现视力下降的情况。

快打开超级视力表APP，每天准时检测视力，关注视力变化，预防假性近视。

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