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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
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| optical biometry | Experimental |
| |
| ultrasonic biometry | Experimental |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| optical biometry | Device | 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. |
| Measure | Description | Time Frame |
|---|---|---|
| desired post operative refraction | 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) | postoperative refraction 1 month |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Esraa A Okasha, Resident | Contact | 01028909988 | esraa011037@med.sohag.edu.eg | |
| Usama A Mohamed, Professor | Contact | 01005470455 |
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| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 20447976 | Background | Tappeiner C, Rohrer K, Frueh BE, Waelti R, Goldblum D. Clinical comparison of biometry using the non-contact optical low coherence reflectometer (Lenstar LS 900) and contact ultrasound biometer (Tomey AL-3000) in cataract eyes. Br J Ophthalmol. 2010 May;94(5):666-7. doi: 10.1136/bjo.2009.167700. No abstract available. | |
| 22018365 |
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| Type | Date | Date Unknown |
|---|---|---|
| Release | Jan 3, 2023 | |
| Reset | Oct 24, 2023 |
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| Release Date | Unrelease Date | Unrelease Date Unknown | Reset Date | MCP Release Number |
|---|---|---|---|---|
| Jan 3, 2023 | Oct 24, 2023 |
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| ultrasonic biometry | Device | 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 |
|
| Wang L, Shirayama M, Ma XJ, Kohnen T, Koch DD. Optimizing intraocular lens power calculations in eyes with axial lengths above 25.0 mm. J Cataract Refract Surg. 2011 Nov;37(11):2018-27. doi: 10.1016/j.jcrs.2011.05.042. |
| 17244216 | Background | Olsen T. Improved accuracy of intraocular lens power calculation with the Zeiss IOLMaster. Acta Ophthalmol Scand. 2007 Feb;85(1):84-7. doi: 10.1111/j.1600-0420.2006.00774.x. |