Assessment of Measurement Variability Across Automated Biometry Devices

This is a non-interventional prospective, single center, bilateral, comparative study of white-to-white, corneal thickness, and anterior chamber depth measurements as taken on the Orbscan II compared to the IOL Master 700 (Zeiss), IOL Master 500 (Zeiss), Atlas 9000 (Zeiss), Lenstar 900 (Haag-Streit), Argos (Alcon), iTrace (Tracey), Pentacam (Oculus), and manual calipers. Additional biometric devices or external photography may be included as well.

Inclusion criteria

• Adults ages 18-50 years of age with healthy eyes and no prior ocular surgery
• At least -1.00 of myopia (spherical equivalent)
• Able to comprehend and willing to sign informed consent and consent and complete all required testing procedures
• Clear intraocular media

Exclusion criteria

• Any corneal abnormality, other than regular corneal astigmatism (as determined by pre-operative testing) that in the opinion of the investigator would confound the outcome(s) of the study
• History of or current retinal conditions or predisposition to retinal conditions
• Amblyopia or strabismus in either eye
• History of or current anterior or posterior segment inflammation of any etiology
• Any form of neovascularization on or within the eye
• Glaucoma (uncontrolled or controlled with medication)
• Optic nerve atrophy
• Subjects with diagnosed degenerative eye disorders
• Subjects who have an acute or chronic disease or illness that would confound the results of this investigation in the opinion of the principal investigator (e.g. connective tissue disease, immunocompromised, clinically significant atopic disease, etc.)