
372 Image Analysis and Modeling in Ophthalmology
where:
h
Eh TT
ct t
=
+−
−
∞∞ ∞
∞
εσ
(19.4)
E is the energy removal by the evaporation of the tear lm (W m
–2
)
h
c∞
is the convection coefcient between the cornea and the environment (W m
–2
K
–1
)
T
∞
is the environment temperature (K)
ɛ is the emissivity of the cornea (dimensionless)
σ is the Stefan–Boltzmann constant (W m
–2
K
–4
)
As an initial condition for a transient simulation, the temperature distribution in the
human eye under steady-state conditions, obtained previously without the source of heat
due to the laser radiation term, was used.
In order to calculate the temperature and the thermal ...