Estimate the near point of convergence and assess binocular near-vision function.
| 距离 | 集合需求(Δ) | 场景 |
|---|
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Definition of the near point of convergence | The nearest distance at which binocular single vision can be maintained | ISO 13666:2019, Ophthalmic optics - Vocabulary |
| Convergence demand | Convergence demand (prism dioptres) = 10 · PD(cm) / viewing distance (cm) | Scheiman M, Wick B, Clinical Management of Binocular Vision: Heterophoric, Accommodative, and Eye Movement Disorders |
| Typical values | The near point of convergence is commonly about 6-10 cm; a receded value suggests convergence insufficiency | Scheiman M, Wick B, Clinical Management of Binocular Vision |
| Unit of prism dioptre | One prism dioptre deviates a ray by 1 cm at a distance of 1 m | ISO 13666:2019, Ophthalmic optics - Vocabulary |
根据瞳距与注视距离计算集合需求量，评估辐辏近点与集合功能状态。
辐辏集合近点距离计算器，根据瞳距与距离计算集合需求量，评估辐辏近点与集合功能。。医疗专业工具，基于权威医学标准，仅供参考。