# Analysis of Defocus Curve of Pre-Presbyopic and Emerging Presbyopic Patients

> **NCT04474782** · — · COMPLETED · sponsor: **Vance Thompson Vision** · enrollment: 45 (actual)

## Conditions studied

- Presbyopia

## Interventions

- **DIAGNOSTIC_TEST:** There is not an intervention

## Key facts

- **NCT ID:** NCT04474782
- **Lead sponsor:** Vance Thompson Vision
- **Sponsor class:** OTHER
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** COMPLETED
- **Start date:** 2019-10-17
- **Primary completion:** 2020-08-31
- **Final completion:** 2020-08-31
- **Target enrollment:** 45 (ACTUAL)
- **Last updated:** 2021-03-30

## Collaborators

- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04474782

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04474782, "Analysis of Defocus Curve of Pre-Presbyopic and Emerging Presbyopic Patients". Retrieved via AI Analytics 2026-06-02 from https://api.ai-analytics.org/clinical/NCT04474782. Licensed CC0.

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