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Detection system for ocular refractive error measurement

L Ventura1, S J de Faria e Sousa, J C de Castro

  • 1Instituto de Física de São Carlos (USP), Grupo de Otica, São Carlos (SP), Brazil. liliane@ultra3000.ifqsc.sc.usp.br

Physics in Medicine and Biology
|June 12, 1998
PubMed
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A new system automatically measures refractive errors like myopia and astigmatism using a laser and CCD detector. This objective method offers precise, reliable results comparable to traditional techniques.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optical Physics

Background:

  • Accurate measurement of ocular refractive errors (myopia, hyperopia, astigmatism) is crucial for vision correction.
  • Existing refractors often rely on subjective patient responses or complex optical alignments.
  • Development of objective and automated systems is essential for efficient and precise diagnosis.

Purpose of the Study:

  • To develop an automatic and objective system for measuring ocular refractive errors.
  • To introduce an innovative ring-shaped target and matrix CCD detector for enhanced measurement capabilities.
  • To validate the system's accuracy and precision against established methods.

Main Methods:

  • A diode laser (850 nm) projects a ring target onto the patient's fundus.

Related Experiment Videos

  • Scattered light from the retina is analyzed for vergence using a matrix CCD detector.
  • Commercial frame grabber and heuristic search software replaced dedicated circuits for signal processing.

    • Main Results:

    • The system demonstrated good agreement with retinoscopic measurements in both model and human eyes.
    • Achieved measurement precision of 0.125D and 5 degrees, meeting clinical requirements.
    • The innovative design simplified optical alignment and expanded the measurement range.

    Conclusions:

    • The developed system provides an accurate, objective, and precise method for measuring ocular refractive errors.
    • The use of a ring target and matrix detector offers advantages over conventional refractor designs.
    • This automated system has the potential to improve the efficiency and reliability of refractive error assessment.