You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: medialCanthus.m
    path of file: ./repos/gkaModelEye/model/eye/species/+human/+landmarks
    
    the code of the file until where you have to start completion: function medialCanthus = medialCanthus( eye )
% Returns the medial canthus landmark sub-field of an eye model structure
%

    
function medialCanthus = medialCanthus( eye )
% Returns the medial canthus landmark sub-field of an eye model structure
%
% Syntax
%  medialCanthus = human.landmarks.medialCanthus( eye )
%
% Description:
%   Calculates the position of the medial canthus. For these default
%   values, we assume that the axis of the head is aligned with the optic
%   axis of the eye and camera.
%
%   We begin with the width of the palpebral fissure. This can vary
%   substantially by sex and race. We assume a width of 27.5 mm, which was
%   the mean size observed for Black men ages 20-39 years old:
%
%       Price, Kristina M., et al. "Eyebrow and eyelid dimensions: an
%       anthropometric analysis of African Americans and Caucasians."
%       Plastic and reconstructive surgery 124.2 (2009): 615-623.
%
%   In primary position, the palpebral fissure has a slightly greater
%   extent on the medial as compared to lateral side. Based upon anatomical
%   forensic measurements, we set this ratio as 44/56:
%
%       Stephan, Carl N., and Paavi L. Davidson. "The placement of the
%       human eyeball and canthi in craniofacial identification." Journal
%       of Forensic Sciences 53.3 (2008): 612-619.
%
%   Therefore, we distribute the 27.5 mm palpebral fissure width so that
%   the lateral canthus is 12 mm lateral to the corneal apex, and the
%   medial canthus is 15.5 mm medial to the corneal apex.
%
%   The depth of the lateral canthus to the corneal apex is set to 10mm
%   (figure 3):
%
%       van den Bosch, Willem A., Ineke Leend