---
title: Night Myopia and Dark Focus of Accommodation
nct_id: NCT03358550
overall_status: COMPLETED
phase: NA
sponsor: University of Applied Sciences Jena
study_type: INTERVENTIONAL
primary_condition: Dark Focus of Accommodation
countries: Germany
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT03358550.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT03358550"
ct_last_update_post_date: 2017-11-30
last_seen_at: "2026-05-12T06:04:16.785Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Night Myopia and Dark Focus of Accommodation

**Official Title:** Influence of an Imaginary Target on the State of Accommodation Under Scotopic Conditions

**NCT ID:** [NCT03358550](https://clinicaltrials.gov/study/NCT03358550)

## Key Facts

- **Status:** COMPLETED
- **Phase:** NA
- **Study Type:** INTERVENTIONAL
- **Target Enrollment:** 39
- **Lead Sponsor:** University of Applied Sciences Jena
- **Conditions:** Dark Focus of Accommodation
- **Start Date:** 2017-02-02
- **Completion Date:** 2017-03-23
- **CT.gov Last Update:** 2017-11-30

## Brief Summary

Shifts in accommodation at decreasing luminance levels are considered as principle cause for night myopia. Previous studies with laser optometers quantified the dark focus of accommodation up to 3 D. In addition to the measurement of dark focus, the aim of this study was to investigate the influence of an imaginary target at finite distances on the state of accommodation at scotopic luminance.

## Detailed Description

Accommodation was measured by using an open-field autorefractor (WAM 5500, GRAND SEIKO). Full corrected right eyes of 39 subjects aged from 18 to 40 years were investigated in this randomized, cross-sectional study. Accommodation measurements in photopic luminance were taken for 6 m of empty field and for optotype fixation at 2 m, 1 m and 0.5 m. At scotopic luminance, dark focus of accommodation was examined directly after darkening and after 10 min of dark adaptation. After adaptation, subjects had to visualize imaginary targets in the four distances while accommodation was measured.

## Eligibility

- **Minimum age:** 22 Years
- **Maximum age:** 39 Years
- **Sex:** ALL
- **Healthy Volunteers:** Yes

```
Inclusion Criteria:

* age 18 - 44
* visual acuity at least 0.8 (5/6)

Exclusion Criteria:

* medication with an impact on the visual system
* visual disease or disease with an impact on the visual system
* pregnancy or other hormonal variances
* drug usage
* overfatigue at the period of investigation
* mental handicap
```

## Arms

- **Accommodation in scotopic luminance** (EXPERIMENTAL)

## Interventions

- **Accommodation Measurement** (DIAGNOSTIC_TEST) — Accommodation was measured for different distances and light conditions.

## Primary Outcomes

- **Shift of accommodation in scotopic luminance (Dark focus)** _(time frame: Baseline only)_ — Accommodative shift in scotopic luminance compared to photopic luminance for empty field (dark focus of accommodation)

## Secondary Outcomes

- **Difference of accommodation for 2 m target** _(time frame: Baseline only)_
- **Difference of accommodation for 1 m target** _(time frame: Baseline only)_
- **Difference of accommodation for 0.5 m target** _(time frame: Baseline only)_

## Locations (1)

- University of Applied Sciences, Jena, Thuringia, Germany

## Recent Field Changes (last 30 days)

- `eligibility.maxAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.phases` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `outcomes.secondary` — added _(2026-05-12)_
- `armsInterventions.arms` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.university of applied sciences|jena|thuringia|germany` — added _(2026-05-12)_

---

*Canonical: https://parkinsonspathways.com/agent/trials/NCT03358550.md*  
*Source data (authoritative): https://clinicaltrials.gov/study/NCT03358550*  
*This page is a raw mirror with no AI summary, no editorial enrichment, and no Parkinson's-specific filtering.*