Comparison of a Smartphone Based Self Refraction Tool With Conventional Refraction Error Estimation Methods

Status

UNKNOWN

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT03419351

Enrollment

Registered

2018-02-01

Start date

2017-11-20

Completion date

2018-03-31

Last updated

2018-02-01

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Refractive Errors, Self-Examination

Brief summary

Self evaluating tools based on smartphone devices are public available on the market for each person. The tools are used to estimate the existing refractive error for each eye of a patient. Hereafter, e.g. ordering glasses via internet could be the next step for this persons. The daily routine within an eye hospital shows, that estimation of the refractive error is a difficult and time consuming procedure. The study compares the results of the measured refractive error using a smartphone based tool with the results of conventional measurement methods.

Interventions

DIAGNOSTIC_TESTSmartphone

Smartphone based measurement of refractive error and visual acuity testing using these measurements.

DIAGNOSTIC_TESTAutorefractor

Autorefractor based measurement of refractive error and visual acuity testing using these measurements.

DIAGNOSTIC_TESTIndividual

Individual, human measurement of refractive error and visual acuity testing using these measurements.

Study design

Allocation

Intervention model

SINGLE_GROUP

Primary purpose

DIAGNOSTIC

Masking

NONE

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Yes

Inclusion criteria

* existing refractive error * using glasses or contac lenses

Exclusion criteria

* opacities (visus limitating) of cornea, lens or vitreous * known ocular pathologies except refractive error * epilepsia * irregular corneal topography

Design outcomes

Primary

Measure	Time frame	Description
Refractive Error	6 month	Comparison of refractive error measurements between methods

Secondary

Measure	Time frame	Description
Visual acuity	6 month	Visual acuity of persons using based on different methods.
Personal evaluation of measuring accuracy (Questionnaire)	6 month	Would persons be willing to order glasses by using only self-test-results?
Time consumption	6 month	Comparison of needed time to reach self-test refraction error results and conservative-test results.

Countries

Germany

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026