“…Tear-film volume x m, mm Distance along conjunctival sac beginning from the apex of the fornix Subscript index denoting compartment i Mixing parameter for conjunctival sac i Characteristic ratio from Equations (B.9-10) 1 , 2 rad Beginning (y 1 ) and end (y 2 ) positions of palpebral aperture A rad Angular medial-lateral width of palpebral aperture s À1 , min À1 Tear-turnover rate in min -1 i Fraction of total lacrimal secretion directed to conjunctival sac i m PaÁs, cP Tear viscosity kg/m 3 , g/cm 3 Tear density N/m, mN/m Tear surface tension ' A rad Angular superior-inferior height of palpebral aperture ! rad/s Lid-opening angular velocity during deposition…”