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Contribution of posterior corneal astigmatism to total corneal astigmatism in a simple of Egyptian population / Alaa Mohamed Badawy Mohamed ; Supervised Lubna Khazbak , Mohamed Hosny , Sarah Azzam

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Alaa Mohamed Badawy Mohamed , 2020Description: 53 P. : charts , facimiles ; 25cmOther title:
  • نسبة اللانقطية للسطع الخلفى للقرنية الى اللانقطية فى عينة من المصريين [Added title page title]
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  • Issued also as CD
Dissertation note: Thesis (M.Sc.) - Cairo University - Faculty of Medicine - Department of Ophthalmology Summary: Background: Accurate measurement of total corneal astigmatism is critical in correcting astigmatism following cataract surgery and in accurate calculation of toric Iols .The astigmatism of the anterior and posterior corneal surfaces both contribute to the total corneal astigmatism. Previously, the posterior corneal astigmatism was neglected during measurement of total corneal astigmatism which resulted in errors during calculation and correction of astigmatism. Purpose: To determine the percentage of contribution of the magnitude of posterior corneal astigmatism to total corneal astigmatism using Pentacam (Scheimpflug) imaging . Method: This is a prospective cross sectional study conducted on 356 eyes of 356 patients, where the total corneal astigmatism was calculated by addition of anterior and posterior corneal astigmatism using vector analysis and then the percentage of posterior to total corneal astigmatism was calculated . Results: The percentage of contribution of posterior to total corneal astigmatism was about 30 % in patients 2 With the rule 3astigmatism and about 8% in patients 2Against the rule 3 astigmatism.Conclusion: posterior corneal astigmatism shouldn{u2019}t be neglected during calculation of total corneal astigmatism as neglecting posterior corneal astigmatism can result in errors during calculation and correction of astigmatism
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Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.11.24.M.Sc.2020.Al.C (Browse shelf(Opens below)) Not for loan 01010110081717000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.11.24.M.Sc.2020.Al.C (Browse shelf(Opens below)) 81717.CD Not for loan 01020110081717000
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Cai01.11.24.M.Sc.2020.Ah.C Comparison between the effect of latanoprost 0.005%, travoprost 0.004% and tafluprost 0.0015% on diurnal intraocular pressure fluctuation in patients having primary open-angle glaucoma / Cai01.11.24.M.Sc.2020.Ah.C Comparison between the effect of latanoprost 0.005%, travoprost 0.004% and tafluprost 0.0015% on diurnal intraocular pressure fluctuation in patients having primary open-angle glaucoma / Cai01.11.24.M.Sc.2020.Al.C Contribution of posterior corneal astigmatism to total corneal astigmatism in a simple of Egyptian population / Cai01.11.24.M.Sc.2020.Al.C Contribution of posterior corneal astigmatism to total corneal astigmatism in a simple of Egyptian population / Cai01.11.24.M.Sc.2020.Am.E Efficacyof intracameralbetamethasone versus intracameral dexamethasone at the end of phacoemulsification in controlling postoperative corneal edema, endothelial cell loss and inflammation / Cai01.11.24.M.Sc.2020.Am.E Efficacyof intracameralbetamethasone versus intracameral dexamethasone at the end of phacoemulsification in controlling postoperative corneal edema, endothelial cell loss and inflammation / Cai01.11.24.M.Sc.2020.As.I Interobserver agreement in spectral domain optical coherence tomography description of epiretinal membranes in the presence of macular edema /

Thesis (M.Sc.) - Cairo University - Faculty of Medicine - Department of Ophthalmology

Background: Accurate measurement of total corneal astigmatism is critical in correcting astigmatism following cataract surgery and in accurate calculation of toric Iols .The astigmatism of the anterior and posterior corneal surfaces both contribute to the total corneal astigmatism. Previously, the posterior corneal astigmatism was neglected during measurement of total corneal astigmatism which resulted in errors during calculation and correction of astigmatism. Purpose: To determine the percentage of contribution of the magnitude of posterior corneal astigmatism to total corneal astigmatism using Pentacam (Scheimpflug) imaging . Method: This is a prospective cross sectional study conducted on 356 eyes of 356 patients, where the total corneal astigmatism was calculated by addition of anterior and posterior corneal astigmatism using vector analysis and then the percentage of posterior to total corneal astigmatism was calculated . Results: The percentage of contribution of posterior to total corneal astigmatism was about 30 % in patients 2 With the rule 3astigmatism and about 8% in patients 2Against the rule 3 astigmatism.Conclusion: posterior corneal astigmatism shouldn{u2019}t be neglected during calculation of total corneal astigmatism as neglecting posterior corneal astigmatism can result in errors during calculation and correction of astigmatism

Issued also as CD

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