A Comprehensive Assessment of Anterior Corneal Power by Different Devices

A Comprehensive Assessment of the Precision and Agreement of Anterior Corneal Power Measurements Obtained Using Different Devices

To comprehensively assess the precision and agreement of anterior corneal power measurements using 8 different devices.

Volunteers with healthy corneas will be measured by different instruments to detect their anterior corneal power. Only the right eye of each subject was selected. Measurements were repeated in the second session scheduled 1 to 2 weeks later.

Inclusion Criteria:

• healthy cornea,
• best corrected distance visual acuity (BCVA) equal to or better than 20/25,
• willing and able to comply with scheduled visits and other study procedures.

Exclusion Criteria:

• History of refractive surgery or any keratoplasty procedure,
• use of contact lenses,
• history of corneal dystrophies or degenerative diseases,
• history of glaucoma or ocular hypertension,
• significant subjective dry eye symptoms, Schirmer I test results of less than 5.0 mm, tear film break-up time shorter than 5 seconds and corneal fluorescein staining positive.