To evaluate the refractive outcomes of cataract surgery in PEX syndrome and determine which of the commonly used IOL formulas (SRK/T, Barrett Universal II and Hill-RBF) is the best in predicting postoperative refractive outcomes in PEX.

The primary outcome measure was to compare refractive outcomes (MAE, MedAE, percentage of eyes within certain range of prediction error) in PEX and control eyes. The secondary outcome measure was to determine whether any of IOL power prediction formulas (SRK/T, Barrett Universal II and Hill-RBF) is more precise for these challenging eyes.

Inclusion Criteria:

• senile cataract with/without PEX

Exclusion Criteria:

• corneal pathology
• glaucoma,
• corneal astigmatism greater than 2.0 diopters (D),
• previous eye surgery or subjects with decreased vision due to other reasons than cataract (e.g., exudative age-related macular degeneration (AMD), proliferative diabetic retinopathy, inflammatory eye diseases),
• intraoperative complications,
• postoperative corrected distance visual acuity (CDVA) worse than 20/40,
• axial length below 21 mm and above 25 mm,
• dense cataracts or poor fixation requiring ultrasound biometry
• eyes with manifest iridophacodonesis and those in which a capsular tension ring was inserted

Patients above 18 yo with senile cataract with/without PEX without coexisting ocular pathologies