What term describes the impairment that indicates rehabilitation need?

• A. Functional loss
• B. Visual acuity deficit
• C. Color vision deficiency
• D. Peripheral field loss

Answer: (A)

In vision rehabilitation, the need for rehabilitation is determined by how vision loss affects daily functioning, not just by a specific clinical measurement. The term that describes the impairment signaling rehabilitation need is functional loss. It reflects the practical limitations a person experiences in tasks and participation—like reading, mobility, safety, or managing chores—that determine whether rehab services are appropriate.

Visual acuity deficit focuses on the sharpness of vision, a precise sensory measurement. While important clinically, it doesn’t automatically tell us how that vision loss changes day-to-day activities. Color vision deficiency is a specific inability to distinguish colors and may affect certain tasks, but it’s not a general indicator that rehabilitation is needed. Peripheral field loss describes the extent of side vision loss, which can impact navigation, yet again it’s a particular deficit type rather than the overall effect on functioning. Functional loss best captures the real-world impact across activities and independence, guiding the decision to pursue vision rehabilitation services.