Purpose: To assess the efficacy of photorefractive keratectomy (PRK) in patients who underwent corneal transplantation, and to determine the influencing factors. Methods: The present study was a retrospective chart review research that was conducted at Dhahran Eye Specialist Hospital between 2014 and 2017. Results: Seventy-nine eyes were included in the study. The mean BCVA showed an improvement of two lines post-PRK as compared to that before PRK (0.73 ± 0.1 and 0.54 ± 0.2, respectively). There was a statistically significant decrease in the cylindrical value postoperatively as compared to that preoperatively (−2.15 ± 1.4 and−3.25 ± 1.8, respectively; p < 0.001). However, there was no statistically significant difference in spherical equivalent and sphere. Three eyes (4%) developed postoperative complications. There was a medium positive correlation between residual stroma and achieved spherical equivalent (SE) (r = 0.305, p = 0.006), as well as between optical zone and postoperative uncorrected visual acuity (r = 0.350, p = 0.001), in addition to post SE (r = 0.307, p = 0.006). However, the depth of ablation showed a medium negative correlation with achieved SE (r = −0.375, p = 0.001). Conclusion: PRK may be an option for correcting refractive errors in patients who underwent keratoplasty. The optical zone and residual stromal thickness have a positive correlation with the effects of the outcomes, whereas the depth of ablation has a negative correlation with the outcomes.
Published in | Advances in Surgical Sciences (Volume 12, Issue 2) |
DOI | 10.11648/j.ass.20241202.11 |
Page(s) | 43-50 |
Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
Copyright |
Copyright © The Author(s), 2024. Published by Science Publishing Group |
Photorefractive Keratectomy, Keratoplasty, Refractive Errors
Wavefront-guided | Topography-guided | Total sample | |
---|---|---|---|
Gender | |||
Male | 20 (69.0 %) | 32 (64.0%) | 50 (64.9%) |
Female | 9 (31.0%) | 18 (36.0%) | 27 (35.1%) |
Age in years | |||
Less than 30 | 12 (44.4 0/0) | 23 (51.1 %) | 35 (45.4 0%) |
30 and above | 15 (55.6 %) | 22 (48.9 %) | 37 (48%) |
Treated eye | |||
OD | 7 (24.1 %) | 22 (44.0 %) | 29 (36.7%) |
OS | 22 (75.2 %) | 28 (56.0 %) | 50 (63.3%) |
Primary Diagnosis | |||
Keratoconus | 74 (93.7%) | ||
Other diagnoses | 5 (6.3%) |
Eyes (n) | 79 |
---|---|
Penetrating keratoplasty | 31 (39.2%) |
Lamellar keratoplasty | 40 (50.6%) |
Associated conditions (n) | |
Glaucoma/ocular hypertension | 2 |
cataract | 2 |
Keratoplasty-related complications | 8 (10.1%) |
PRK-related complications | 3 (4%) |
Duration (months) between PRK and | Mean (Range) |
Keratoplasty | 32.7 (21 - 42.5) |
Suture removal | 14.6 (4.25 - 21.75) |
Last follow-up | 16.84 (5 - 24) |
PRK, photorefractive keratectomy. |
Range | |
---|---|
CCT | 400 — 650 pm |
Residual stroma | 300 — 500 um |
Optical zone | 5 — 7 mm |
Ablation zone | 8 — 9 mm |
CCT, central corneal thickness |
Wavefrontguided | Topographyguided | Total | |
---|---|---|---|
Preoperative (PRK) spherical equivalent (D) | -3.96 ± 2.6 | -2.54 ± 1.9 | -3.23 ± 2.5 |
Postoperative (PRK) Spherical equivalent (D) | -1.79 ± 1.8 | -4.35 ± 3.5 | -3.26 ± 2.9 |
P value | 0.004* | 0.014* | 0.552 |
Preoperative (PRK) spherical power (D) | -3.12 ± 2.9 | -3.03 ± 3.4 | -2.82 ± 3.1 |
Postoperative (PRK) spherical power (D) | -0.80 ± 1.5 | -3.00 ± 3.4 | -2.08 ± 2.8 |
P value | 0.001* | 0.283 | 0.182 |
Preoperative (PRK) cylindrical power (D) | -3.13 ± 1.6 | -3.61 ± 1.7 | -3.25 ± 1.8 |
Postoperative (PRK) cylindrical power (D) | -1.99 ± 1.5 | -2.46 ± 1.5 | -2.15± 1.4 |
P value | 0.027* | 0.001* | <0.001* |
All the visual acuities are in decimals PRK, photorefractive keratectomy. |
Wavefront-guided | Topography-guided | Total | |
---|---|---|---|
Preoperative (PRK) BCVA | 0.52 ± 0.21 | 0.54 ± 0.20 | 0.54 ± 0.2 |
Postoperative (PRK) BCVA | 0.68 ± 0.25 | 0.65 ± 0.21 | 0.73 ± 0.1 |
P value | 0.001* | 0.005* | <0.001* |
All the visual acuities are in decimals. PRK, photorefractive keratectomy; BCVA, best corrected visual acuity, |
PRK | Photorefractive Keratectomy |
SE | Spherical Equivalent |
BUVA | Best Uncorrected Visual Acuity |
BCVA | Best Corrected Visual Acuity |
MMC | Mitomycin C |
TG-PRK | Topography-Guided Photorefractive Keratectomy |
UCDVA | Uncorrected Distance Visual Acuity |
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APA Style
Al-Sahaf, E., Aljindan, M. (2024). Outcomes of Photorefractive Keratectomy in Patients Who Underwent Keratoplasty. Advances in Surgical Sciences, 12(2), 43-50. https://doi.org/10.11648/j.ass.20241202.11
ACS Style
Al-Sahaf, E.; Aljindan, M. Outcomes of Photorefractive Keratectomy in Patients Who Underwent Keratoplasty. Adv. Surg. Sci. 2024, 12(2), 43-50. doi: 10.11648/j.ass.20241202.11
@article{10.11648/j.ass.20241202.11, author = {Esra Al-Sahaf and Mohanna Aljindan}, title = {Outcomes of Photorefractive Keratectomy in Patients Who Underwent Keratoplasty }, journal = {Advances in Surgical Sciences}, volume = {12}, number = {2}, pages = {43-50}, doi = {10.11648/j.ass.20241202.11}, url = {https://doi.org/10.11648/j.ass.20241202.11}, eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ass.20241202.11}, abstract = {Purpose: To assess the efficacy of photorefractive keratectomy (PRK) in patients who underwent corneal transplantation, and to determine the influencing factors. Methods: The present study was a retrospective chart review research that was conducted at Dhahran Eye Specialist Hospital between 2014 and 2017. Results: Seventy-nine eyes were included in the study. The mean BCVA showed an improvement of two lines post-PRK as compared to that before PRK (0.73 ± 0.1 and 0.54 ± 0.2, respectively). There was a statistically significant decrease in the cylindrical value postoperatively as compared to that preoperatively (−2.15 ± 1.4 and−3.25 ± 1.8, respectively; p Conclusion: PRK may be an option for correcting refractive errors in patients who underwent keratoplasty. The optical zone and residual stromal thickness have a positive correlation with the effects of the outcomes, whereas the depth of ablation has a negative correlation with the outcomes. }, year = {2024} }
TY - JOUR T1 - Outcomes of Photorefractive Keratectomy in Patients Who Underwent Keratoplasty AU - Esra Al-Sahaf AU - Mohanna Aljindan Y1 - 2024/08/20 PY - 2024 N1 - https://doi.org/10.11648/j.ass.20241202.11 DO - 10.11648/j.ass.20241202.11 T2 - Advances in Surgical Sciences JF - Advances in Surgical Sciences JO - Advances in Surgical Sciences SP - 43 EP - 50 PB - Science Publishing Group SN - 2376-6182 UR - https://doi.org/10.11648/j.ass.20241202.11 AB - Purpose: To assess the efficacy of photorefractive keratectomy (PRK) in patients who underwent corneal transplantation, and to determine the influencing factors. Methods: The present study was a retrospective chart review research that was conducted at Dhahran Eye Specialist Hospital between 2014 and 2017. Results: Seventy-nine eyes were included in the study. The mean BCVA showed an improvement of two lines post-PRK as compared to that before PRK (0.73 ± 0.1 and 0.54 ± 0.2, respectively). There was a statistically significant decrease in the cylindrical value postoperatively as compared to that preoperatively (−2.15 ± 1.4 and−3.25 ± 1.8, respectively; p Conclusion: PRK may be an option for correcting refractive errors in patients who underwent keratoplasty. The optical zone and residual stromal thickness have a positive correlation with the effects of the outcomes, whereas the depth of ablation has a negative correlation with the outcomes. VL - 12 IS - 2 ER -