In placebo-treated eyes , there was myopic progression of -1.55 diopters ( D ) , between baseline and 36 months , associated with reductions in corneal curvature ( K ; -0.13 D ) and anterior chamber depth ( ACD ; -0.17 mm ) and increases in lens thickness ( LT ; 0.05 mm ) , vitreous chamber depth ( VCD ; 0.65 mm ) , and axial length ( AL ; 0.53 mm ) .