NRA is described as what in relation to accommodation and convergence?

NRA is described as what in relation to accommodation and convergence?

• A. NRA measures convergence directly and accommodation indirectly.
• B. NRA is a direct measure of accommodation and an indirect measure of convergence.
• C. NRA measures accommodation and convergence directly.
• D. NRA is purely subjective.

Answer: (B)

NRA tests how much you can relax your accommodation at a near target while keeping fusion and clarity. By adding plus lenses, the eye’s required accommodation decreases, so the accommodative system must relax to maintain focus. The point at which vision becomes blurred or diplopia occurs reflects how much accommodation can be relaxed, giving a direct readout of accommodation capacity. Convergence isn’t measured directly in this test; however, changes in accommodation drive some convergence through the accommodative-convergence reflex, so NRA provides indirect information about convergence (via the AC/A relationship).

NRA tests how much you can relax your accommodation at a near target while keeping fusion and clarity. By adding plus lenses, the eye’s required accommodation decreases, so the accommodative system must relax to maintain focus. The point at which vision becomes blurred or diplopia occurs reflects how much accommodation can be relaxed, giving a direct readout of accommodation capacity. Convergence isn’t measured directly in this test; however, changes in accommodation drive some convergence through the accommodative-convergence reflex, so NRA provides indirect information about convergence (via the AC/A relationship).