[
    {
        "id": "osp-13011",
        "type": "article-journal",
        "title": "Accuracy of intraocular lens power calculation in high myopia",
        "author": [
            {
                "family": "Ghanem",
                "given": "Asaad A"
            },
            {
                "family": "El-Sayed",
                "given": "Hosam M"
            }
        ],
        "URL": "https://omanscience.com/ar/articles/accuracy-of-intraocular-lens-power-calculation-in-high-myopia",
        "language": "en",
        "issued": {
            "date-parts": [
                [
                    2010
                ]
            ]
        },
        "container-title": "Oman Journal of Ophthalmology",
        "volume": "3",
        "issue": "3",
        "page": "126-130",
        "DOI": "10.4103/0974-620x.71888",
        "publisher": "Medknow Publications",
        "ISSN": "0974-620X",
        "abstract": "Purpose: To study the accuracy of different recent intraocular lens (IOL) calculation formulas in predicting a target postoperative refraction ± 1.0D (Diopters) in patients with long eyes (axial length ≥ 26.0 mm) undergoing phacoemulsification.\n\nMaterials and methods: This study comprised 127 eyes of 87 patients who presented with cataract and axial eye length ≥ 26 mm. Before phacoemulsification and IOL implantation; axial length measurement using immersion ultrasound A-scan technique, and autokeratometry with or without computerized corneal topography for K readings were done. The IOL power was calculated using four formulas, namely the SRK-T, Hoffer-Q, Holladay-2, and Haigis formulas. Four months after surgery, refraction was done. Differences between actual postoperative refraction and assumed target refraction using the different formulas were analyzed. P < 0.05 was considered statistically significant.\n\nResults: In all 127 eyes, the mean axial length was 31.71 mm (range, 26.06-37.11 mm) and the mean K was 44.68 D (range, 40.05-55.14D). The mean preoperative spherical equivalent (SE) was -17.52D (range, -12.25 to -30.50D). After surgery, the mean spherical equivalent was -0.8 ± 0.83D (range, +1.25 to -3.75D). The mean postoperative refractive SE when implanting a plus power IOLs was -0.3 ± 0.51D (P < 0.001) while the mean postoperative refractive SE when implanting a minus power IOLs was +1.21 ± 0.11D denoting a highly significant tendency toward hyperopia (P < 0.001). Concerning the minus power group, most postoperative refractive error was within +1.0 to +2.0D in the actual implanted IOL and in all other formula calculated IOL power. However, Haigis formula showed the least deviation while SRK-T and other formulas showed a greater tendency toward hyperopia.\n\nConclusions: In eyes with high axial myopia, the performance of SRK-T, Hoffer-Q, Holladay-2 and Haigis formulas are comparable in low plus-powered IOL implantation. Haigis formula is the best formula when minus power IOL is implanted."
    }
]