Pseudophakic Eyes With Presbyopia-correcting IOLs: OCT Biometry and Pyramid Aberrometry

Who May Qualify: 1. Men and women aged above 21 years with prior uncomplicated cataract/IOL exchange surgery 2. Willing to sign willing to sign a consent form before measurements 3. Corrected distance visual acuity (CDVA) of 0.1 logMAR or better 4. Absence of corneal scars/dry eye disease that could falsify the light transmission of the study eye 5. Total absence of posterior capsule opacification or patients who already have undergone Nd:YAG capsulotomy 6. Absence of ocular comorbidity (Macular degeneration, glaucoma, amblyopia) Who Should NOT Join This Trial: 1. Prior corneal refractive or ocular surgery 2. Posterior capsule opacification. 3. Keratometry between \<42.5 and \>45 D, 4. Corneal spherical aberration \> 0.4 microns 5) Angle kappa \> 0.4 mm 6\) Zonular weakness 7) Pseudoexfoliation syndrome 8) Eccentric fixation or insufficient ability to fixate (tremor, nystagmus) 9) Pregnancy Always talk to your doctor about whether this trial is right for you.