One prominent advantage of this study was the use of the Lenstar LS 900 for ocular biometry, a device which has been shown to have high accuracy and can measure CCT, ACD, LT and AL, in addition to keratometric (K) readings and corneal diameter (CD). This machine measures AL from the surface of the cornea (epithelium including the tear film) to the macular pigmentary epithelium and ACD from the surface of the cornea to the anterior surface of the crystalline lens (Fig 1). Shammas et al. reported that the precision of the measurements obtained by the Lenstar was extremely high.