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Related Experiment Videos

Peripheral astigmatic asymmetry and angle alpha

M C Dunne1, G P Misson, E K White

  • 1Department of Vision Sciences, Aston University, Birmingham, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|July 1, 1993
PubMed
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Peripheral astigmatic asymmetry was found to be symmetrical nasal to the visual axis in 34 eyes. This asymmetry significantly exceeded angle alpha, suggesting additional optical factors or misalignment.

Area of Science:

  • Ophthalmology
  • Optometry
  • Visual Optics

Background:

  • Peripheral astigmatism describes how refractive error changes towards the eye's periphery.
  • Angle alpha relates to the alignment of the visual axis with the optical axis.
  • Understanding these parameters is crucial for accurate vision correction.

Purpose of the Study:

  • To investigate the relationship between peripheral astigmatic asymmetry and angle alpha.
  • To determine the symmetry point of peripheral astigmatism in relation to the visual axis.

Main Methods:

  • Measurements of peripheral astigmatism were performed on 34 eyes using a Hartinger coincidence optometer and a Canon R-1 autorefractometer.
  • Angle alpha was estimated by aligning Purkinje images from the cornea and lens.

Related Experiment Videos

  • Data analysis involved curve fitting and differentiation to find astigmatism minima.

    • Main Results:

    • Peripheral astigmatism exhibited symmetry around a point on the nasal retina.
    • This symmetry point deviated significantly from the visual axis (8.8-9.4 degrees).
    • These deviations were substantially larger than the measured angle alpha (5.0 degrees).

    Conclusions:

    • Peripheral astigmatic asymmetry is not solely explained by angle alpha.
    • Potential contributing factors include asymmetrical curvature of optical surfaces.
    • Further misalignment of ocular optical surfaces may also play a role.