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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.
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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Accommodation in scotopic luminance | Experimental |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Accommodation Measurement | Diagnostic Test | Accommodation was measured for different distances and light conditions. |
|
| Measure | Description | Time Frame |
|---|---|---|
| Shift of accommodation in scotopic luminance (Dark focus) | Accommodative shift in scotopic luminance compared to photopic luminance for empty field (dark focus of accommodation) | Baseline only |
| Measure | Description | Time Frame |
|---|---|---|
| Difference of accommodation for 2 m target | Accommodative shift in scotopic luminance compared to photopic luminance for the fixation of a target in 2 m | Baseline only |
| Difference of accommodation for 1 m target |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Philipp Hessler, M.Sc. | University of Applied Sciences Jena | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Applied Sciences | Jena | Thuringia | 07745 | Germany |
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Sequence of tests was randomized. It is no multi-arm study.
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Accommodative shift in scotopic luminance compared to photopic luminance for the fixation of a target in 1 m
| Baseline only |
| Difference of accommodation for 0.5 m target | Accommodative shift in scotopic luminance compared to photopic luminance for the fixation of a target in 0.5 m | Baseline only |