Calculation of Intraocular Lens in High Myopic Cataractous Patients
Conditions
Brief summary
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
Detailed description
* 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
Interventions
DEVICEoptical biometry
optical biometry is a fast, noncontact method it uses the method of partial coherence interferometry (PCI) to measure the axial length (AXL), based on reflection of the interference signal of the retinal pigment epithelium.
DEVICEultrasonic biometry
ultrasonic biometry is contact method depends on ultrasonic transducer producing thin sound beam travelling through different media of the eye when it faces interface of substance dissimilar from that it is travelling through part is reflecting and the other travel through the different substance
Sponsors
Sohag University
Study design
Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
30 Years to No maximum
Healthy volunteers
Yes
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)
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| desired post operative refraction | postoperative refraction 1 month | detection of postoperative refraction by the use of autorefractor (one of the objective methods of assessment of refraction) after use of IOL power calculated by different investigations (optical vs ultrasonic) |
Contacts
Primary ContactEsraa A Okasha, Resident
Backup ContactUsama A Mohamed, Professor
Outcome results
None listed