Low NRA is associated with what conditions?

Low NRA is associated with what conditions?

• A. Low NRA suggests difficulty relaxing accommodation and/or low PFV reserves.
• B. Low NRA indicates excessive accommodation at near.
• C. Low NRA is typical in myopic patients.
• D. Low NRA means high convergence reserves.

Answer: (A)

Negative Relative Accommodation shows how well a person can relax accommodation while maintaining clear, single vision at near. It’s measured by giving plus lenses to a near target and finding how much plus power the eyes can tolerate before blur or loss of fusion occurs. A low NRA means the eye cannot relax accommodation easily, so only a small amount of plus can be added before symptoms appear. This often goes hand in hand with limited positive fusional vergence reserves, making near tasks harder because the vergence system can’t compensate as well when accommodation is reduced. So the result points to difficulty relaxing accommodation and/or low PFV reserves.

Negative Relative Accommodation shows how well a person can relax accommodation while maintaining clear, single vision at near. It’s measured by giving plus lenses to a near target and finding how much plus power the eyes can tolerate before blur or loss of fusion occurs. A low NRA means the eye cannot relax accommodation easily, so only a small amount of plus can be added before symptoms appear. This often goes hand in hand with limited positive fusional vergence reserves, making near tasks harder because the vergence system can’t compensate as well when accommodation is reduced. So the result points to difficulty relaxing accommodation and/or low PFV reserves.