Short-term corneal changes with gas-permeable contact lens wear in keratoconus subjects: A comparison of two fitting approaches
Purpose: To evaluate changes in anterior corneal topography and higher-order aberrations (HOA) after 14-days of rigid gas-permeable (RGP) contact lens (CL) wear in keratoconus subjects comparing two different fitting approaches. Methods: Thirty-one keratoconus subjects (50 eyes) without previous his...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2015-01-01
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| Series: | Journal of Optometry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1888429614000703 |
| _version_ | 1818554501551882240 |
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| author | Miguel Romero-Jiménez Jacinto Santodomingo-Rubido Patricia Flores-Rodríguez Jose-Manuel González-Méijome |
| author_facet | Miguel Romero-Jiménez Jacinto Santodomingo-Rubido Patricia Flores-Rodríguez Jose-Manuel González-Méijome |
| author_sort | Miguel Romero-Jiménez |
| collection | DOAJ |
| description | Purpose: To evaluate changes in anterior corneal topography and higher-order aberrations (HOA) after 14-days of rigid gas-permeable (RGP) contact lens (CL) wear in keratoconus subjects comparing two different fitting approaches.
Methods: Thirty-one keratoconus subjects (50 eyes) without previous history of CL wear were recruited for the study. Subjects were randomly fitted to either an apical-touch or three-point-touch fitting approach. The lens’ back optic zone radius (BOZR) was 0.4 mm and 0.1 mm flatter than the first definite apical clearance lens, respectively. Differences between the baseline and post-CL wear for steepest, flattest and average corneal power (ACP) readings, central corneal astigmatism (CCA), maximum tangential curvature (KTag), anterior corneal surface asphericity, anterior corneal surface HOA and thinnest corneal thickness measured with Pentacam were compared.
Results: A statistically significant flattening was found over time on the flattest and steepest simulated keratometry and ACP in apical-touch group (all p < 0.01). A statistically significant reduction in KTag was found in both groups after contact lens wear (all p < 0.05). Significant reduction was found over time in CCA (p = 0.001) and anterior corneal asphericity in both groups (p < 0.001). Thickness at the thinnest corneal point increased significantly after CL wear (p < 0.0001). Coma-like and total HOA root mean square (RMS) error were significantly reduced following CL wearing in both fitting approaches (all p < 0.05).
Conclusion: Short-term rigid gas-permeable CL wear flattens the anterior cornea, increases the thinnest corneal thickness and reduces anterior surface HOA in keratoconus subjects. Apical-touch was associated with greater corneal flattening in comparison to three-point-touch lens wear. |
| first_indexed | 2024-12-12T09:40:30Z |
| format | Article |
| id | doaj.art-7006cec9be674012bee11c00beb62973 |
| institution | Directory Open Access Journal |
| issn | 1888-4296 |
| language | English |
| last_indexed | 2024-12-12T09:40:30Z |
| publishDate | 2015-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Optometry |
| spelling | doaj.art-7006cec9be674012bee11c00beb629732022-12-22T00:28:34ZengElsevierJournal of Optometry1888-42962015-01-0181485510.1016/j.optom.2014.07.007Short-term corneal changes with gas-permeable contact lens wear in keratoconus subjects: A comparison of two fitting approachesMiguel Romero-Jiménez0Jacinto Santodomingo-Rubido1Patricia Flores-Rodríguez2Jose-Manuel González-Méijome3MGR Doctores, Madrid, SpainMenicon Co. Ltd., Madrid, SpainPontificia Universidad Católica de Valparaíso, ChileClinical & Experimental Optometry Research Lab, Center of Physics, University of Minho, Braga, PortugalPurpose: To evaluate changes in anterior corneal topography and higher-order aberrations (HOA) after 14-days of rigid gas-permeable (RGP) contact lens (CL) wear in keratoconus subjects comparing two different fitting approaches. Methods: Thirty-one keratoconus subjects (50 eyes) without previous history of CL wear were recruited for the study. Subjects were randomly fitted to either an apical-touch or three-point-touch fitting approach. The lens’ back optic zone radius (BOZR) was 0.4 mm and 0.1 mm flatter than the first definite apical clearance lens, respectively. Differences between the baseline and post-CL wear for steepest, flattest and average corneal power (ACP) readings, central corneal astigmatism (CCA), maximum tangential curvature (KTag), anterior corneal surface asphericity, anterior corneal surface HOA and thinnest corneal thickness measured with Pentacam were compared. Results: A statistically significant flattening was found over time on the flattest and steepest simulated keratometry and ACP in apical-touch group (all p < 0.01). A statistically significant reduction in KTag was found in both groups after contact lens wear (all p < 0.05). Significant reduction was found over time in CCA (p = 0.001) and anterior corneal asphericity in both groups (p < 0.001). Thickness at the thinnest corneal point increased significantly after CL wear (p < 0.0001). Coma-like and total HOA root mean square (RMS) error were significantly reduced following CL wearing in both fitting approaches (all p < 0.05). Conclusion: Short-term rigid gas-permeable CL wear flattens the anterior cornea, increases the thinnest corneal thickness and reduces anterior surface HOA in keratoconus subjects. Apical-touch was associated with greater corneal flattening in comparison to three-point-touch lens wear.http://www.sciencedirect.com/science/article/pii/S1888429614000703CorneaKeratoconusContact lenses |
| spellingShingle | Miguel Romero-Jiménez Jacinto Santodomingo-Rubido Patricia Flores-Rodríguez Jose-Manuel González-Méijome Short-term corneal changes with gas-permeable contact lens wear in keratoconus subjects: A comparison of two fitting approaches Journal of Optometry Cornea Keratoconus Contact lenses |
| title | Short-term corneal changes with gas-permeable contact lens wear in keratoconus subjects: A comparison of two fitting approaches |
| title_full | Short-term corneal changes with gas-permeable contact lens wear in keratoconus subjects: A comparison of two fitting approaches |
| title_fullStr | Short-term corneal changes with gas-permeable contact lens wear in keratoconus subjects: A comparison of two fitting approaches |
| title_full_unstemmed | Short-term corneal changes with gas-permeable contact lens wear in keratoconus subjects: A comparison of two fitting approaches |
| title_short | Short-term corneal changes with gas-permeable contact lens wear in keratoconus subjects: A comparison of two fitting approaches |
| title_sort | short term corneal changes with gas permeable contact lens wear in keratoconus subjects a comparison of two fitting approaches |
| topic | Cornea Keratoconus Contact lenses |
| url | http://www.sciencedirect.com/science/article/pii/S1888429614000703 |
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