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crowding phenomenon

Refers to the amblyopic eye’s difficulty in discriminating small visual acuity targets when presented together in a row, despite being able to resolve the same size targets when presented individually. This phenomenon is characterized by the amblyopic eye’s reduced ability to perceive and distinguish closely spaced optotypes or letters, even though the individual optotypes can be identified when presented in isolation. It is a common feature observed in amblyopia and can impact visual acuity measurements and reading ability.