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The statement about patients with amblyopia performing better when shown individual letters than a whole line is true. This is because individuals with amblyopia, often referred to as "lazy eye," have reduced vision in one eye due to abnormal visual development. When testing visual acuity, presenting individual letters allows the patient to focus on one character at a time rather than trying to grasp the overall line. As a result, this focused approach can help patients with amblyopia better perceive the individual letters, contributing to a more accurate assessment of their visual acuity.

In contrast, when presented with an entire line, the individual may struggle to interpret the information effectively, as their vision may not be proficient enough to decipher multiple letters at once. This approach also aligns with common testing practices used to evaluate visual function in such patients, emphasizing the need for tailored testing methods based on the specific visual impairment.