Nodal points and the eye.

  title={Nodal points and the eye.},
  author={MichaelA. Simpson},
  journal={Applied optics},
  volume={61 10},
Nodal points are defined using parallel object and image rays at very small angles to the optical axis, and Johann Listing described them when characterizing the eye in 1845. They are only distinct from principal points when there is a refractive index difference, but Reginald Clay used the term "nodal slide" in 1904 for equipment that uses lens rotation when measuring a lens focal length in air. Over time, sketches of nodal rays at large angles have become common, and these perhaps appear to… 

Letter to the Editor: Radial and Tangential Retinal Magnifications

  • M. Simpson
  • Physics
    Translational vision science & technology
  • 2023
The article “Radial and Tangential Retinal Magnifications as Functions of Visual Field Angle Across Spherical, Oblate, and Prolate Retinal Profiles” by Hastings et al.1 gives a very thorough

Widefield and Ultra-Widefield Retinal Imaging: A Geometrical Analysis

A geometrical analysis was conducted to assess the field of view (FOV) of WF and UWF imaging, comparing it to the angular extension of the retina, which allowed the detailed visualization of the peripheral retina with significant impact on the diagnosis and management of DR.

Study the Field of View Influence on the Monchromatic and Polychromatic Image Quality of a Human Eye

In this paper, the effect of the eye field of view (known as F.O.V.) on the performance and quality of the image of the human eye is studied, analyzed, and presented in detail. The image quality of

Visual Axis and Stiles–Crawford Effect Peak Show a Positional Correlation in Normal Eyes: A Cohort Study

The visual axis and SCE peak locations varied among the participants; however, they were highly correlated with each other for each individual, suggesting a potential mechanism underlying the foveal cone photoreceptor alignment.