Comparison of corneal hysteresis and corneal resistance factor after small-incision lenticule extraction and photorefractive keratectomy
Purpose The aim of this study was to compare the corneal hysteresis (CH) and corneal resistance factor (CRF) after small-incision lenticule extraction (SMILE) and photorefractive keratectomy (PRK). Patients and methods Fifty-six eyes of 28 patients were included in this study. The study eyes had myo...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2017-01-01
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| Series: | Delta Journal of Ophthalmology |
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| Online Access: | http://www.djo.eg.net/article.asp?issn=1110-9173;year=2017;volume=18;issue=1;spage=1;epage=6;aulast=Al-Nashar |
| _version_ | 1818399808719683584 |
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| author | Haitham Y Al-Nashar Ahmad M.B Awad |
| author_facet | Haitham Y Al-Nashar Ahmad M.B Awad |
| author_sort | Haitham Y Al-Nashar |
| collection | DOAJ |
| description | Purpose The aim of this study was to compare the corneal hysteresis (CH) and corneal resistance factor (CRF) after small-incision lenticule extraction (SMILE) and photorefractive keratectomy (PRK).
Patients and methods Fifty-six eyes of 28 patients were included in this study. The study eyes had myopia or myopic astigmatism with spherical equivalent less than or equal to −6 D. They were divided into two groups: group I (28 eyes of 14 patients) was corrected using the SMILE technique and group II (28 eyes of 14 patients) was corrected using the PRK technique. CH and CRF were measured in all eyes preoperatively and postoperatively using the ocular response analyzer instrument. Best-corrected visual acuity, spherical equivalent, and central corneal thickness were documented preoperatively and postoperatively in each follow-up visit. All patients were followed up at 3, 6, and 12 months postoperatively.
Results The mean patients’ age was 23.8±4.2 years in group I and 24.1±4.7 years in group II (P=0.85). In the SMILE group, CH changed from 10.57±0.38 preoperatively to 8.6±0.26 at 12 months postoperatively (P<0.001), whereas in the PRK group it decreased from 10.7±0.4 to 8.7±0.26 (P<0.001). CRF changed from 10.21±0.1 to 8.4±0.2 and from 10.2±0.11 to 8.5±0.22 after SMILE and PRK, respectively (P<0.001). There were no significant changes in corneal biomechanical factors between SMILE and PRK after 12 months (P=0.1).
Conclusion CH and CRF decreased after SMILE and PRK. There were no differences between SMILE and PRK treatments in postoperative CH or CRF values. |
| first_indexed | 2024-12-14T07:26:34Z |
| format | Article |
| id | doaj.art-c19a622d703647089dd2f1ba2b315014 |
| institution | Directory Open Access Journal |
| issn | 1110-9173 2090-4835 |
| language | English |
| last_indexed | 2024-12-14T07:26:34Z |
| publishDate | 2017-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Delta Journal of Ophthalmology |
| spelling | doaj.art-c19a622d703647089dd2f1ba2b3150142022-12-21T23:11:30ZengWolters Kluwer Medknow PublicationsDelta Journal of Ophthalmology1110-91732090-48352017-01-011811610.4103/1110-9173.201624Comparison of corneal hysteresis and corneal resistance factor after small-incision lenticule extraction and photorefractive keratectomyHaitham Y Al-NasharAhmad M.B AwadPurpose The aim of this study was to compare the corneal hysteresis (CH) and corneal resistance factor (CRF) after small-incision lenticule extraction (SMILE) and photorefractive keratectomy (PRK). Patients and methods Fifty-six eyes of 28 patients were included in this study. The study eyes had myopia or myopic astigmatism with spherical equivalent less than or equal to −6 D. They were divided into two groups: group I (28 eyes of 14 patients) was corrected using the SMILE technique and group II (28 eyes of 14 patients) was corrected using the PRK technique. CH and CRF were measured in all eyes preoperatively and postoperatively using the ocular response analyzer instrument. Best-corrected visual acuity, spherical equivalent, and central corneal thickness were documented preoperatively and postoperatively in each follow-up visit. All patients were followed up at 3, 6, and 12 months postoperatively. Results The mean patients’ age was 23.8±4.2 years in group I and 24.1±4.7 years in group II (P=0.85). In the SMILE group, CH changed from 10.57±0.38 preoperatively to 8.6±0.26 at 12 months postoperatively (P<0.001), whereas in the PRK group it decreased from 10.7±0.4 to 8.7±0.26 (P<0.001). CRF changed from 10.21±0.1 to 8.4±0.2 and from 10.2±0.11 to 8.5±0.22 after SMILE and PRK, respectively (P<0.001). There were no significant changes in corneal biomechanical factors between SMILE and PRK after 12 months (P=0.1). Conclusion CH and CRF decreased after SMILE and PRK. There were no differences between SMILE and PRK treatments in postoperative CH or CRF values.http://www.djo.eg.net/article.asp?issn=1110-9173;year=2017;volume=18;issue=1;spage=1;epage=6;aulast=Al-Nasharcorneal biomechanicscorneal hysteresiscorneal resistance factorphotorefractive keratectomysmall-incision lenticule extraction |
| spellingShingle | Haitham Y Al-Nashar Ahmad M.B Awad Comparison of corneal hysteresis and corneal resistance factor after small-incision lenticule extraction and photorefractive keratectomy Delta Journal of Ophthalmology corneal biomechanics corneal hysteresis corneal resistance factor photorefractive keratectomy small-incision lenticule extraction |
| title | Comparison of corneal hysteresis and corneal resistance factor after small-incision lenticule extraction and photorefractive keratectomy |
| title_full | Comparison of corneal hysteresis and corneal resistance factor after small-incision lenticule extraction and photorefractive keratectomy |
| title_fullStr | Comparison of corneal hysteresis and corneal resistance factor after small-incision lenticule extraction and photorefractive keratectomy |
| title_full_unstemmed | Comparison of corneal hysteresis and corneal resistance factor after small-incision lenticule extraction and photorefractive keratectomy |
| title_short | Comparison of corneal hysteresis and corneal resistance factor after small-incision lenticule extraction and photorefractive keratectomy |
| title_sort | comparison of corneal hysteresis and corneal resistance factor after small incision lenticule extraction and photorefractive keratectomy |
| topic | corneal biomechanics corneal hysteresis corneal resistance factor photorefractive keratectomy small-incision lenticule extraction |
| url | http://www.djo.eg.net/article.asp?issn=1110-9173;year=2017;volume=18;issue=1;spage=1;epage=6;aulast=Al-Nashar |
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