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Ophthalmic Technician

Category - Visual Assessment

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A 16-year-old boy is diagnosed with amblyopia in one eye due to uncorrected refractive error. He has difficulty reading all the letters on a given line on the visual chart, but is able to identify each letter when shown individually. What is this phenomenon called?

Bell’s phenomenon
Crowding phenomenon
Masking phenomenon
Doubling phenomenon

Explanation

Answer: B - Crowding phenomenon is seen in individuals with amblyopia in which the person can read all the letters when shown individually, but cannot read letters when shown together in a line.

Patients with amblyopia have a better visual acuity while reading single optotypes rather than reading multiple optotypes together.

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