# Effect of Number of Zones on Subjective Vision in Concentric Bifocal Optics

> Research article (Optometry and Vision Science, 2015) · cited 10× · AI/ML

**Wikidata**: [openalex:W2412042958](https://www.wikidata.org/wiki/openalex:W2412042958)  
**Source**: https://4ort.xyz/entity/effect-of-number-of-zones-on-subjective-vision-in-concentric-bifocal-optics