Guinea Pig Eye Biometrics Measurement

All guinea pigs were labeled and numbered, and SE was measured in a dark room with streak retinoscopy (YZ24; Six-Six Vision Technology Co., Ltd). Measurements were averaged three times and were accurate to 0.01 D. The conjunctival sac was filled with 1% tropicamide drops three times, each time at 5 min intervals, and the axial length of the eye was measured using A-scan ultrasound (OD1-A, Kaixin Electronic Instrument Co., Ltd., China). Manual measurements were averaged 10 times and were accurate to 0.01 mm. Fundus photography was used to take pictures of the fundus of the right eye of each guinea pig after anesthesia (VISUCAM 200; Carl Zeiss, Jena, Germany).