Comparison Between Different Investigations Used in Intraocular Lens Calculation in High Myopic Cataractous Patients

Optical Biometry Versus Ultrasonic Biometry in Intraocular Lens Calculation in High Myopic Cataractous Patients: A Comparative Study

the purpose of the study is to compare the accuracy of optical and ultrasonic biometry in intraocular lens (IOL) calculation in high myopic cataractous patients

• Prospective interventional (QUASI experimental) comparative study
• This study will be conducted on high myopic cataractous patients scheduled for phacoemulsification and IOL implantation in department of ophthalmology, Sohag university
• patients will be divided into 2 groups one will be subjected to intraocular lens (IOL) calculation by optical biometry the second one will be subjected to intraocular lens (IOL) calculation by ultrasonic biometry
• postoperative auto refraction after I month

Inclusion Criteria:

• patients with simple cataract not associated with other pathologies suitable for phacoemulsification and 1ry IOL implantation With axial length (AXL) equal to or greater than 26.5mm

Exclusion Criteria:

1. History of trauma
2. Associated pathologies such as optic neuropathy, age related macular degeneration, macular edema, retinal detachment, , ocular inflammation, retinitis pigmentosa, proliferative diabetic retinopathy
3. corneal opacities or irregularities, scars, dystrophy or ectasia
4. Patients who underwent previous corneal surgery (including refractive surgery)
5. Patients having intraoperative complications as inability to achieve secure 'in the bag' placement of the IOL (i.e. due to posterior capsule rupture, vitreous loss, weak zonules, or zonular rupture)