Anterior Scleral Thickness Profile in Keratoconus
Purpose: Considering that peripheral corneal thinning occurs in keratoconus (KC), the anterior scleral thickness (AST) profile was measured to compare thickness variations in healthy and KC eyes across several meridians. Methods: This cross-sectional case–control study comprised 111 eyes of 111 pati...
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MDPI AG
2023-11-01
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| Series: | Life |
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| Online Access: | https://www.mdpi.com/2075-1729/13/11/2223 |
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| author | Neus Burguera-Giménez María Amparo Díez-Ajenjo Noemí Burguera Cristina Peris-Martínez |
| author_facet | Neus Burguera-Giménez María Amparo Díez-Ajenjo Noemí Burguera Cristina Peris-Martínez |
| author_sort | Neus Burguera-Giménez |
| collection | DOAJ |
| description | Purpose: Considering that peripheral corneal thinning occurs in keratoconus (KC), the anterior scleral thickness (AST) profile was measured to compare thickness variations in healthy and KC eyes across several meridians. Methods: This cross-sectional case–control study comprised 111 eyes of 111 patients: 61 KC eyes and 50 age- and axial-length-matched healthy eyes. The AST was explored at three scleral eccentricities (1, 2, and 3 mm from the scleral spur) across four scleral zones (nasal, temporal, superior, and inferior) by using swept-source optical coherence tomography. The AST variations among eccentricities and scleral regions within and between groups were investigated. Results: The AST significantly varied with scleral eccentricity in healthy eyes over the temporal meridian (<i>p</i> = 0.009), whereas in KC eyes, this variation was observed over the nasal (<i>p</i> = 0.001), temporal (<i>p</i> = 0.029) and inferior (<i>p</i> = 0.006) meridians. The thinnest point in both groups was 2 mm posterior to the scleral spur (<i>p</i> < 0.001). The sclera was thickest over the inferior region (control 581 ± 52 μm, KC 577 ± 67 μm) and thinnest over the superior region (control 448 ± 48 μm, KC 468 ± 58 μm) in both populations (<i>p</i> < 0.001 for all eccentricities). The AST profiles were not significantly different between groups (<i>p</i> > 0.05). The inferior–superior thickness asymmetry was statistically different 2 mm posterior to the scleral spur between groups (<i>p</i> = 0.009), specifically with subclinical KC (<i>p</i> = 0.03). There is a trend where the asymmetry increases, although not significantly, with the KC degree (<i>p</i> > 0.05). Conclusions: KC eyes presented significant thickness variations among eccentricities over the paracentral sclera. Although AST profiles did not differ between groups, the inferior–superior asymmetry differences demonstrated scleral changes over the vertical meridian in KC that need further investigation. |
| first_indexed | 2024-03-09T16:40:12Z |
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| id | doaj.art-8e5b5600f6b3444f83d3801aba9e6c9a |
| institution | Directory Open Access Journal |
| issn | 2075-1729 |
| language | English |
| last_indexed | 2024-03-09T16:40:12Z |
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| spelling | doaj.art-8e5b5600f6b3444f83d3801aba9e6c9a2023-11-24T14:52:39ZengMDPI AGLife2075-17292023-11-011311222310.3390/life13112223Anterior Scleral Thickness Profile in KeratoconusNeus Burguera-Giménez0María Amparo Díez-Ajenjo1Noemí Burguera2Cristina Peris-Martínez3Anterior Segment and Cornea and External Eye Diseases Unit, Foundation Ophthalmological Medical Hospital (FOM), Av. Pío Baroja, 12, E-46015 Valencia, SpainAnterior Segment and Cornea and External Eye Diseases Unit, Foundation Ophthalmological Medical Hospital (FOM), Av. Pío Baroja, 12, E-46015 Valencia, SpainQ Vision, Ophthalmology Department, Vithas Virgen del Mar Hospital, Ctra. el Mami a Viator, Km.1, E-04120 Almería, SpainAnterior Segment and Cornea and External Eye Diseases Unit, Foundation Ophthalmological Medical Hospital (FOM), Av. Pío Baroja, 12, E-46015 Valencia, SpainPurpose: Considering that peripheral corneal thinning occurs in keratoconus (KC), the anterior scleral thickness (AST) profile was measured to compare thickness variations in healthy and KC eyes across several meridians. Methods: This cross-sectional case–control study comprised 111 eyes of 111 patients: 61 KC eyes and 50 age- and axial-length-matched healthy eyes. The AST was explored at three scleral eccentricities (1, 2, and 3 mm from the scleral spur) across four scleral zones (nasal, temporal, superior, and inferior) by using swept-source optical coherence tomography. The AST variations among eccentricities and scleral regions within and between groups were investigated. Results: The AST significantly varied with scleral eccentricity in healthy eyes over the temporal meridian (<i>p</i> = 0.009), whereas in KC eyes, this variation was observed over the nasal (<i>p</i> = 0.001), temporal (<i>p</i> = 0.029) and inferior (<i>p</i> = 0.006) meridians. The thinnest point in both groups was 2 mm posterior to the scleral spur (<i>p</i> < 0.001). The sclera was thickest over the inferior region (control 581 ± 52 μm, KC 577 ± 67 μm) and thinnest over the superior region (control 448 ± 48 μm, KC 468 ± 58 μm) in both populations (<i>p</i> < 0.001 for all eccentricities). The AST profiles were not significantly different between groups (<i>p</i> > 0.05). The inferior–superior thickness asymmetry was statistically different 2 mm posterior to the scleral spur between groups (<i>p</i> = 0.009), specifically with subclinical KC (<i>p</i> = 0.03). There is a trend where the asymmetry increases, although not significantly, with the KC degree (<i>p</i> > 0.05). Conclusions: KC eyes presented significant thickness variations among eccentricities over the paracentral sclera. Although AST profiles did not differ between groups, the inferior–superior asymmetry differences demonstrated scleral changes over the vertical meridian in KC that need further investigation.https://www.mdpi.com/2075-1729/13/11/2223anterior scleral thicknesskeratoconusinferior–superior asymmetryswept-source OCTsclera |
| spellingShingle | Neus Burguera-Giménez María Amparo Díez-Ajenjo Noemí Burguera Cristina Peris-Martínez Anterior Scleral Thickness Profile in Keratoconus Life anterior scleral thickness keratoconus inferior–superior asymmetry swept-source OCT sclera |
| title | Anterior Scleral Thickness Profile in Keratoconus |
| title_full | Anterior Scleral Thickness Profile in Keratoconus |
| title_fullStr | Anterior Scleral Thickness Profile in Keratoconus |
| title_full_unstemmed | Anterior Scleral Thickness Profile in Keratoconus |
| title_short | Anterior Scleral Thickness Profile in Keratoconus |
| title_sort | anterior scleral thickness profile in keratoconus |
| topic | anterior scleral thickness keratoconus inferior–superior asymmetry swept-source OCT sclera |
| url | https://www.mdpi.com/2075-1729/13/11/2223 |
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