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Related Experiment Video

Updated: Oct 2, 2025

Subjective Refraction Test Using a Smartphone for Vision Screening
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Smartphone-based corneal topography with null-screens.

Oliver Huerta-Carranza, Manuel Campos-García, Victor Ivan Moreno-Oliva

    Applied Optics
    |February 24, 2022
    PubMed
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    This study presents a smartphone-based corneal topographer for measuring the human eye's corneal surface shape. The device demonstrates feasibility and accuracy comparable to commercial topographers.

    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Optical Engineering

    Background:

    • Accurate measurement of corneal shape is crucial for diagnosing and managing various eye conditions.
    • Existing corneal topographers can be expensive and less portable.
    • Advancements in smartphone technology offer potential for developing low-cost, accessible diagnostic tools.

    Purpose of the Study:

    • To design and characterize a compact corneal topographer utilizing smartphone capabilities.
    • To evaluate the performance of the smartphone-based topographer, including distortion compensation.
    • To demonstrate the feasibility of using this device for human corneal surface measurements.

    Main Methods:

    • Development of a compact corneal topographer integrated with a smartphone.

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    Last Updated: Oct 2, 2025

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    Smartphone Fundus Photography
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  • Image acquisition using the smartphone camera and lens.
  • Calculation and compensation for optical distortions introduced by the smartphone lens.
  • Surface topography measurements on human corneas.
  • Comparison of results with a commercial corneal topographer.

    • Main Results:

    • The compact corneal topographer successfully measured human corneal surface topography.
    • Distortion compensation algorithms were developed and applied.
    • Measurements obtained using the smartphone-based system showed consistency with a commercial topographer.
    • The proposed method proved feasible for analyzing corneal surface characteristics.

    Conclusions:

    • A smartphone-based corneal topographer is a feasible and accurate tool for measuring corneal shape.
    • This technology offers a potential low-cost and portable alternative to conventional topographers.
    • Further development could enhance accessibility for eye care diagnostics.