The Comparative Study of Refractive Index Variations between Haigis, Srk/T and Hoffer-Q Formulas Used for Preoperative Biometry Calculation in Patients with the Axial Length >25 mm
Background: To compare refractive index variation between Hoffer-Q, Haigis and SRK/T formulas used for preoperative biometry calculation in patients with axial length >25 mm, undergoing cataract surgery. Materials and Methods: This is a randomized clinical trial study was performed on 54 eyes of...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2017-01-01
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| Series: | Advanced Biomedical Research |
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| Online Access: | http://www.advbiores.net/article.asp?issn=2277-9175;year=2017;volume=6;issue=1;spage=78;epage=78;aulast=Razmjoo |
| _version_ | 1811217981445767168 |
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| author | Hasan Razmjoo Hosein Atarzadeh Neda Kargar Mohammad Behfarnia Kobra Nasrollahi Ali Kamali |
| author_facet | Hasan Razmjoo Hosein Atarzadeh Neda Kargar Mohammad Behfarnia Kobra Nasrollahi Ali Kamali |
| author_sort | Hasan Razmjoo |
| collection | DOAJ |
| description | Background: To compare refractive index variation between Hoffer-Q, Haigis and SRK/T formulas used for preoperative biometry calculation in patients with axial length >25 mm, undergoing cataract surgery. Materials and Methods: This is a randomized clinical trial study was performed on 54 eyes of 54 patients with ages of 40–70 years old and axial length >25 mm classified into three groups that their IOL POWER were calculated by Haigis, SRK/T and Hoffer-Q formulas before undergoing cataract surgery. Their refractive index variations were calculated from the difference between predicted refractive error formula and actual post-operative refractive error formula. The collected data was entered in SPSS software and was analyzed by ANOVA and Chi-square statistical test. Results: With comparison sphere, astigmatism and spherical equivalent indexes before and after of cataract surgery between Haigis, SRK/T, and Hoffer-Q formulas, statistically significant differences were found between the mean of sphere and SE indexes in patients with use of Haigis and SRK/T formulas that have been more favorable post-operative refraction. Conclusions: Haigis formula and then, with slight difference, SRK/T formula have better and more acceptable post-operative refraction results than Hoffer-Q formula in patients with high axial myopia. Therefore, it is recommended using Haigis and SRK/T formulas for IOL power calculation in patients with high axial myopia undergoing cataract surgery. |
| first_indexed | 2024-04-12T07:02:21Z |
| format | Article |
| id | doaj.art-226b9373a36444cf949ff71b6535cd19 |
| institution | Directory Open Access Journal |
| issn | 2277-9175 |
| language | English |
| last_indexed | 2024-04-12T07:02:21Z |
| publishDate | 2017-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Advanced Biomedical Research |
| spelling | doaj.art-226b9373a36444cf949ff71b6535cd192022-12-22T03:42:57ZengWolters Kluwer Medknow PublicationsAdvanced Biomedical Research2277-91752017-01-0161787810.4103/2277-9175.210657The Comparative Study of Refractive Index Variations between Haigis, Srk/T and Hoffer-Q Formulas Used for Preoperative Biometry Calculation in Patients with the Axial Length >25 mmHasan RazmjooHosein AtarzadehNeda KargarMohammad BehfarniaKobra NasrollahiAli KamaliBackground: To compare refractive index variation between Hoffer-Q, Haigis and SRK/T formulas used for preoperative biometry calculation in patients with axial length >25 mm, undergoing cataract surgery. Materials and Methods: This is a randomized clinical trial study was performed on 54 eyes of 54 patients with ages of 40–70 years old and axial length >25 mm classified into three groups that their IOL POWER were calculated by Haigis, SRK/T and Hoffer-Q formulas before undergoing cataract surgery. Their refractive index variations were calculated from the difference between predicted refractive error formula and actual post-operative refractive error formula. The collected data was entered in SPSS software and was analyzed by ANOVA and Chi-square statistical test. Results: With comparison sphere, astigmatism and spherical equivalent indexes before and after of cataract surgery between Haigis, SRK/T, and Hoffer-Q formulas, statistically significant differences were found between the mean of sphere and SE indexes in patients with use of Haigis and SRK/T formulas that have been more favorable post-operative refraction. Conclusions: Haigis formula and then, with slight difference, SRK/T formula have better and more acceptable post-operative refraction results than Hoffer-Q formula in patients with high axial myopia. Therefore, it is recommended using Haigis and SRK/T formulas for IOL power calculation in patients with high axial myopia undergoing cataract surgery.http://www.advbiores.net/article.asp?issn=2277-9175;year=2017;volume=6;issue=1;spage=78;epage=78;aulast=RazmjooCataract surgeryhigh myopiaIOL power calculation formula |
| spellingShingle | Hasan Razmjoo Hosein Atarzadeh Neda Kargar Mohammad Behfarnia Kobra Nasrollahi Ali Kamali The Comparative Study of Refractive Index Variations between Haigis, Srk/T and Hoffer-Q Formulas Used for Preoperative Biometry Calculation in Patients with the Axial Length >25 mm Advanced Biomedical Research Cataract surgery high myopia IOL power calculation formula |
| title | The Comparative Study of Refractive Index Variations between Haigis, Srk/T and Hoffer-Q Formulas Used for Preoperative Biometry Calculation in Patients with the Axial Length >25 mm |
| title_full | The Comparative Study of Refractive Index Variations between Haigis, Srk/T and Hoffer-Q Formulas Used for Preoperative Biometry Calculation in Patients with the Axial Length >25 mm |
| title_fullStr | The Comparative Study of Refractive Index Variations between Haigis, Srk/T and Hoffer-Q Formulas Used for Preoperative Biometry Calculation in Patients with the Axial Length >25 mm |
| title_full_unstemmed | The Comparative Study of Refractive Index Variations between Haigis, Srk/T and Hoffer-Q Formulas Used for Preoperative Biometry Calculation in Patients with the Axial Length >25 mm |
| title_short | The Comparative Study of Refractive Index Variations between Haigis, Srk/T and Hoffer-Q Formulas Used for Preoperative Biometry Calculation in Patients with the Axial Length >25 mm |
| title_sort | comparative study of refractive index variations between haigis srk t and hoffer q formulas used for preoperative biometry calculation in patients with the axial length 25 mm |
| topic | Cataract surgery high myopia IOL power calculation formula |
| url | http://www.advbiores.net/article.asp?issn=2277-9175;year=2017;volume=6;issue=1;spage=78;epage=78;aulast=Razmjoo |
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