The PacScan 300AP offers a portable, digital, combination A-scan and Pachymeter, with easy-to-use touch screen operation, extreme accuracy, repeatable measurements and reliability. The combination of a high frequency, low noise probe and fast precise algorithm enables scan capture immediately upon application of the probe along the visual axis. The PacScan A-scan offers built-in immersion capabilities and up to eight IOL formulas, including two post-refractive formulas. Axial length, ACD, and lens thickness are provided for each scan. Group up to five scans with average axial length and standard deviation automatically calculated. Easily review each scan, delete outlying scans, and add new scans, as desired. Customizable tissue velocities of each structure and highly-developed automatic scan recognition algorithms ensure accurate and repeatable measures. Built-in calibration check ensures continued accuracy of system. The PacScan Pachymeter measurement accuracy and repeatability are assured by each scan actually consisting of 256 individual measurements and an automatic measurement algorithm to ensure that only scans with proper probe alignment are accepted. The high probe frequency and processing algorithms enable measures as thin as 125 microns, for measuring corneal flap or bed, and multiple corneal maps are available. Also comes standard with central corneal thickness correction calculator for measured applanation IOP.