Refractive Error Correction
Conditions
Keywords
subjective refraction, phoropter, lightfield technology
Brief summary
The aim of this study is to test whether it is possible in principle to determine defective vision using light field technology. The measurements with this first prototype will be compared with the results of the conventional method for subjective refraction determination and those using a phoropter (Vision R-800 phoropter).
Interventions
None listed
Sponsors
Daniela Nosch
Study design
Observational model
CASE_CONTROL
Time perspective
CROSS_SECTIONAL
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Minimum age of 18 years * Best corrected visual acuity ≥ 0.8 (logMAR ≤ 0.1). * Dioptric range for hypermetropia: ≤ +4.50 D. * Dioptric range for myopia: ≥ -6.50 D. * Dioptric range for cylinder: ≤ -2.00 D. * Good general health, i.e.no systemic disease such as diabetes or rheumatism which could influence ocular health * No ocular pathology or history of (intra)ocular surgery except for cataract surgery
Exclusion criteria
* • Contact lens wear during the days of visit * Binocular vision problems (e.g. amblyopia, strabismus). * Inability to follow the procedures of the investigation, such as language problems, psychological disorders and dementia
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| precision of determination of refractive error | within one week | To explore if this prototype CREAL device based on LightField Technology can determine the refractive error reliably, in comparison to well-established methods such as subjective refraction with a trial frame and with the phoropter Vision-R 800 (Essilor SA). |
Secondary
| Measure | Time frame |
|---|---|
| repeatability of all three methods for subjective refraction | within one week |
Countries
Switzerland
Outcome results
None listed