Refractive Development in the “ROP Rat”

Table 1

Parameters for refractive state estimation in rat eye.

Category	Parameters	Symbol	Homogeneous lens model	Core lens model
Refractive indices*	Air	n1	1.000	1.000
	Cornea	n2	1.380	1.380
	Aqueous and vitreous humors	n3, n7	1.337	1.337
	Lens cortex	n4, n6	NA	1.390
	Lens core	n5	1.683	1.500
Axial positions (m)	Anterior cornea surface	A1	Measured from MRI	Measured from MRI
	Posterior cornea surface	A2	Scaled^†	Scaled^†
	Anterior lens surface	A3	Measured from MRI	Measured from MRI
	Anterior core lens surface	A4	NA	Scaled^†
	Posterior core lens surface	A5	NA	Scaled^†
	Posterior lens surface	A6	Measured from MRI	Measured from MRI
	Retina	A7	Measured from MRI + 130 μm	Measured from MRI + 130 μm
Radii of curvature (m)	Anterior cornea surface	rC1	Measured from MRI	Measured from MRI
	Posterior cornea surface	rC2	Scaled^†	Scaled^†
	Anterior lens surface	rL1	Measured from MRI	Measured from MRI
	Anterior core lens surface	rLC1	NA	(A5 − A4)/2
	Posterior core lens surface	rLC2	NA	(A5 − A4)/2
	Posterior lens surface	rL2	Measured from MRI	Measured from MRI
Dioptric powers (D)	Cornea	FC	Equation (1)	Equation (1)
	Lens	FL	Reduced equation (2) (FLhmgns)	Equation (2) (FLcore)
	Whole eye	FE	Equation (3) (FEhmgns)	Equation (3) (FEcore)
	Refractive state	R^╱	Equation (4) (R^╱hmgns)	Equation (4) (R^╱core)

*Refractive indices are adopted from Hughes (1979).
^†Parameters were obtained by scaling linearly to the values obtained from Hughes’ study.