Table 1.

Axial length, IOP, and corneal diameter of blind (beg/beg) and sighted control (beg/+) chickens

Trait	Age	Vision	Mean	SD	Number
Axial length (mm)	6–9 months	blind	20.73	3.24	12
		sighted	16.86	3.36	11
IOP (mm Hg)	6–9 months	blind	13.81	5.32	8
		sighted	13.77	2.71	11
Corneal diameter (mm)	6–9 months	blind	8.30	0.42	10
		sighted	8.75	0.70	12

Axial length and IOP were determined using a BVI Axis II A-scanner and a Tono-Pen XL (TM) tonometer, respectively, as previously described by Inglehearn et al. (1). The sample sizes differ because the data were generated from different batches of birds. However, all batches were derived at the Roslin Institute from the same bird lines using the same husbandry and maintenance protocols.