Custom Manipulation of Corneal Asphericity (The Q Factor)

Faria-Correia, Fernando; AmbrósioJr, Renato; Mendes, J. A.; Cummings, Arthur

doi:10.1007/978-3-319-72263-4_7

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…12,13 Others have recommended keeping the target Q unchanged from its preoperative values. 14 In our study we neither kept the target Q unchanged nor made any adjustments in the refractive nomogram, and we still had 100% of the cases within 0.5 D of emmetropia in the CQ group.…”

Section: Discussionmentioning

confidence: 85%

Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism

Gad¹,

Hosny²,

Ahmed³

et al. 2021

OPTH

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Section: Discussionmentioning

confidence: 85%

Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism

Gad¹,

Hosny²,

Ahmed³

et al. 2021

OPTH

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“…Interocular differences in corneal asphericity can deteriorate binocular vision performance [42]. Moreover, they modify the refractive features of the eyes [43]. Thus, knowledge of the mean values of corneal asphericity could be helpful in planning refractive surgery for patients with DM.…”

Section: Glucose Control Level N (%) or Mean ± Sdmentioning

confidence: 99%

Corneal topography and higher-order aberrations in patients with type 2 diabetes mellitus

Asharlous¹,

Riazi²,

Jamali³

et al. 2023

Med Hypothesis Discov Innov Optom

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Background: Changes in blood sugar levels cause alterations in the anterior segment and retina of the eye. This study was aimed at evaluating corneal topography, aberrometry, and corneal asphericity in patients with treatment-naive type 2 diabetes mellitus (T2DM). Methods: Participants with treatment-naive T2DM were enrolled in this cross-sectional study. The inclusion criteria were glycated hemoglobin A1c (Hb A1c) greater than or equal to 7.5% and absence of other ocular or systemic diseases. Patients who refused to participate or had a history of topical or systemic steroid use, hyperlipidemia, hypertension, anemia, prior ocular disorder or surgery, diabetic retinopathy, glaucoma, cataract, active ocular inflammatory or infectious disease, or contact lens use were excluded. All participants underwent a comprehensive ophthalmic examination. The Pentacam HR Scheimpflug tomography system (Pentacam High Resolution; Oculus, Wetzlar, Germany) was used to measure the anterior-segment parameters. Results: Sixty eyes of 30 patients with a male-to-female ratio of 1:1 were included; the mean (standard deviation [SD]) age and Hb A1c were 51.63 (6.73) years and 8.82% (1.31%), respectively. The mean (SD) values of central corneal thickness, root mean square (RMS) of total aberration, RMS of lower-order aberrations, RMS of higher-order aberrations, spherical aberration, 0° coma, 90° coma, flat anterior keratometry (K), steep anterior K, mean anterior K, anterior topographic astigmatism, flat posterior K, steep posterior K, mean posterior K, posterior topographic astigmatism, anterior corneal asphericity, and posterior corneal asphericity were 540.22 (24.47) µm, 1.72 (0.73) µm, 1.63 (0.73) µm, 0.51 (0.17) µm, + 0.31 (0.09) µm, - 0.06 (0.15) diopters (D), 0.003 (0.21) D, 43.87 (1.49) D, 44.69 (1.50) D, 44.28 (1.44) D, + 0.82 (0.83) D, - 6.25 (0.27) D, - 6.55 (0.31) D, - 6.40 (0.28) D, - 0.30 (0.15) D, - 0.32 (0.12) Q-value, and - 0.47 (0.17) Q-value, respectively. Conclusions: We presented the mean values of Pentacam parameters for aberrometry, keratometry, and corneal asphericity in patients with treatment-naive T2DM. These values could serve as a baseline for prospective monitoring of the ocular health status of this cohort and for comparison with future cohorts of patients with well-controlled T2DM. Further studies are required to assess the presence and applicability of ocular changes following intensive blood glucose control in T2DM and further understand the related pathophysiology.

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Custom Manipulation of Corneal Asphericity (The Q Factor)

Cited by 2 publications

References 17 publications

Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism

Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism

Corneal topography and higher-order aberrations in patients with type 2 diabetes mellitus

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