Table 1. Diabetic and control rat corneas: clinical data and observations by SHG microscopy and other imaging techniques.

Sex	Animal	Blood glucose level (mg/mL)	Age (months)	Cornea	Presence of collagen(SHG microscopy)		Other imaging techniques
					center	periphery
Goto-Kakizaki rats
M	1	507	12	1a right	−	+++	CM
				1b left	−	+++	CM, histology, TEM
	2	559	14	2a left	−	+++
F	3	231	12	3a right	−	+++	CM
				3b left	−	+++	CM
	4	220	12	4a left	+	+++	CM, histology, TEM
	5	422	14	5b right	−	+++	Histology, TEM
Wistar rats
M	6	N/A	5	6a left	−	−	CM
	7	N/A	14	7a left	+	+	CM, histology
	8	N/A	5	8a right	−	−	CM
		N/A		8b left	−	−	CM

Grading is as follows: N/A: not available, −: absence of fibrillar collagen, +: few fibrillar collagen, ++: great concentration of fibrillar collagen, +++: fibrillar collagen over the whole field of view.