visualFields (version 0.6.2)

fiberpathpsi: Average path of a nerve fiber bundle function generator

Description

Generates a function that renders the average path of a nerve fiber bundle that exits through the optic nerve head with a particular angle

Usage

fiberpathpsi( psi0, r0 = 4 )

Arguments

psi0

Angle of incidence of the average bundle path on the optic nerve head

r0

Radius of the optic head nerve. It is a necessity of the model and changing it, changes the calculated average bundle paths. Default value is 4

Value

A function that returns angular coordinates for each radial coordinate.

Details

The function generated works in polar coordinates. The input is the radial coordinate r and output is the angular coordinate. The path in the cartesian (x,y) space is easily obtained with the function jpolar2cart

References

[1] N. M. Jansonius, J. Nevalainen, B. Selig, L. M. Zangwill, P. A. Sample, W. M. Budde, J. B. Jonas, W. A. Lagreze, P. J. Airaksinen, R. Vonthein, L. A. Levin, J. Paetzold, and U. Schiefer. A mathematical description of nerve fiber bundle trajectories and their variability in the human retina. Vision Research, 49(17):2157-2163, 2009.

[2] N. M. Jansonius, J. Nevalainen, B. Selig, L. M. Zangwill, P. A. Sample, W. M. Budde, J. B. Jonas, W. A. Lagreze, P. J. Airaksinen, R. Vonthein, L. A. Levin, J. Paetzold, and U. Schiefer. Erratum to "a mathematical description of nerve fiber bundle trajectories and their variability in the human retina" [vision research 49(17) (2009) 2157-2163]. Vision Research, 50:1501, 2010.

[3] N. M. Jansonius, J. Schiefer, J. Nevalainen, J. Paetzold, and U. Schiefer. A mathematical model for describing the retinal nerve fiber bundle trajectories in the human eye: Average course, variability, and influence of refraction, optic disc size and optic disc position. Experimental Eye Research, 105:70-78, 2012.

See Also

gcloc2psi

Examples

# NOT RUN {
  fiberpathpsi( 90 + 45 )
# }