Bakry, A. E., M. K. Sidky, H. El Shiwy, and A. Hassanein, "Myopia progression in Egyptian Urban children under the influence of online learning during the COVID-19 pandemic", Egyptian Journal of Ophthalmology (MOC), vol. 3, issue 1, pp. 32-40, 2022.
Bakry, A. E., M. Attia, H. El Shiwy, A. Hassanein, and M. K. Sidky, "Assessment of Central Vault Changes induced By Cyclopentolate In Myopic Patients Implanted with the Implantable Phakic Contact Lens®", J Egypt Ophthalmol Soc, vol. 116, issue 1, pp. 34-41, 2023.
Fadeel, S. A., N. Khalil, L. Khazbak, and M. K. Sidky, "Role of epithelial mapping in the differentiation between early keratoconus and high regular astigmatism using spectraldomain optical coherence tomography", J Egypt Ophthalmol Soc, vol. 116, issue 1, pp. 7-14, 2023.
Bakry, A. E., R. Emad, Y. Salah, and M. K. Sidky, "Distance and intermediate visual acuity after a new generation monofocal intraocular lens compared with the standard monofocal intraocular lens implantation", Delta Journal of Ophthalmology, vol. 24, pp. 17-22, 2023.
Alkassabyb, M., A. Bakry, Y. Salah, R. Moussa, and M. K. Sidky, "Refractive changes following yttrium aluminum garnet laser capsulotomy in pseudophakic patients", J Egypt Ophthalmol Soc, vol. 115, issue 4, pp. 193-198, 2022.
Abdelzaher, H. A., M. K. Sidky, A. Awadein, and M. Hosny, "Aniseikonia and visual functions with optical correction and after refractive surgery in axial anisometropia.", International ophthalmology, vol. 42, issue 6, pp. 1669-1677, 2022. Abstract

PURPOSE: To evaluate differences in the subjective aniseikonia and stereoacuity in patients with axial anisometropia after full correction of the refractive error with spectacles, contact lenses, and refractive surgery.

METHODS: A prospective study was performed in Cairo University Hospitals on 20 patients with axial anisometropia caused by unilateral myopia > 5 D with > 4 D inter-ocular difference in spherical equivalent who were suitable candidates for excimer laser ablation (LASIK) or implantable collamer lens implantation (ICL). All patients had measurement of best-corrected visual acuity (BCVA), fusion, stereoacuity, and magnitude of aniseikonia with spectacles, contact lenses, and after surgery.

RESULTS: The mean age at time of surgery was 25.7 ± 3.1 years. There were no statistically significant differences in the BCVA or stereoacuity with spectacles, contact lenses, or after refractive surgery. Microkonia < 5%) was perceived with spectacles in 8 patients (40%) and remained unchanged in 7 of these 8 patients with contact lenses. Following LASIK (n = 11), there was an induced macrokonia < 2% in 4 patients (36%), persistent microkonia of 3% in 1 patient (9%), and no change in image size in 6 (55%) patients. Following ICL implantation (n = 9), there was a perceived macrokonia of 2% in 4 patients (44%), disappearance of microkonia in 1 patient (11%) and no change in 4 patients (44%).

CONCLUSIONS: Differences in BCVA, stereoacuity, and aniseikonia after correction of anisometropia by glasses, contact lens and surgery are both clinically and statistically insignificant. Retinal or neural adaptation might have a role in correction for differences in image size.

Sidky, M. K., D. H. Hassanein, S. A. Eissa, Y. M. Salah, and N. M. Lotfy, "Prevalence of Subclinical Keratoconus Among Pediatric Egyptian Population with Astigmatism.", Clinical ophthalmology (Auckland, N.Z.), vol. 14, pp. 905-913, 2020. Abstract

Purpose: To report the prevalence of subclinical keratoconus (KC), and KC suspects, in pediatric Egyptian population with astigmatic error ≥2 diopters (D), with the use of CSO Sirius tomographer.

Methods: A cross-sectional study that included all the children aged 6-18 years with an astigmatic error of ≥2 D who attended the pediatric ophthalmology clinic for routine checkups during the period between March 2017 and December 2017 was done. All subjects underwent comprehensive ophthalmic examination, and corneal imaging using CSO Sirius instrument, a pentacam with Scheimpflug technology.

Results: There were 547 subjects enrolled in our study. Mean age was 11.34 ± 3.03 (range 6-18) years. There were 278 subjects (50.8%) between 6 and 12 years, and 269 subjects (49.2%) between 12 and 18 years. Males represented 48.4% and females represented 51.6% of patients. Among all the subjects, there were 26 (4.8%) KC patients, 24 (4.4%) KC suspects, and 497 (90.9%) were normal.

Conclusion: Prevalence of subclinical KC among pediatric age group with astigmatism is relatively high, hence the importance of corneal tomography screening of children with astigmatic error ≥2 D.

Eissa, S. A., M. M. Khafagy, and M. K. Sidky, "Implantable Collamer Lens in the Management of Pseudophakic Ametropia.", Journal of refractive surgery (Thorofare, N.J. : 1995), vol. 33, issue 8, pp. 532-537, 2017. Abstract

PURPOSE: To assess Visian Implantable Collamer Lens (ICL) (STAAR Surgical, Monrovia, CA) implantation in the ciliary sulcus to correct pseudophakic ametropia in patients who are not candidates for a keratorefractive procedure.

METHODS: The authors performed a prospective non-comparative case series study of 18 patients (age: 48 to 61 years) with refractive surprise after phacoemulsification. Patients underwent implantation of a piggyback collagen copolymer lens: V4C design in 16 myopic eyes and V4B design in 2 hyperopic eyes. The position and vault of the ICLs were documented at all control visits clinically and with Pentacam (Oculus Optikgeräte, Wetzlar, Germany). Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction spherical equivalent (MRSE), intraocular pressure (IOP), and endothelial cell count were recorded at baseline and 1 week and 1, 6, 12, and 18 months postoperatively.

RESULTS: The MRSE improved from -3.08 ± 2.37 diopters (D) preoperatively to -0.44 ± -0.23 D postoperatively, corrected with a mean ICL power of -3.20 ± 2.90 D. The mean UDVA improved from 1.03 ± 0.12 logMAR preoperatively to 0.05 ± 0.06 logMAR postoperatively (P = .00), whereas CDVA improved from 0.47 ± 0.03 logMAR preoperatively to -0.006 ± 0.02 logMAR (P = .001) postoperatively. None of the cases developed interlenticular opacification throughout the 18-month follow-up. The mean ICL vault measured by Scheimpflug tomography was 451.27 ± 178.5 µm. Acute IOP elevation with anterior uveitis developed in 2 eyes and was controlled by topical steroids and a beta-blocker.

CONCLUSIONS: Sulcus implantation of the secondary ICL to correct pseudophakic refractive error was safe, predictable, and well tolerated in all studied eyes. [J Refract Surg. 2017;33(8):532-537.].

Hosny, M. H., A. Marrie, M. Karim Sidky, S. GamalEldin, and M. Salem, "Results of Femtosecond Laser-Assisted Descemet Stripping Automated Endothelial Keratoplasty.", Journal of ophthalmology, vol. 2017, pp. 8984367, 2017. Abstract

PURPOSE: To evaluate femtosecond laser in DSAEK surgery as an improvement to manual DSAEK.

SETTINGS: Department of Ophthalmology, Cairo University.

DESIGN: A retrospective observational clinical study.

METHODS: 20 eyes with SBK and Fuchs' dystrophy underwent a Femto-assisted DSAEK by laser cutting of two matching posterior stromal discs in the recipient and donor corneas and then fitting the donor disc in the posterior corneal defect of the recipient using Busin's glide or Terry forceps.

RESULTS: Corneal thickness decreased significantly from a mean of 900-micron preoperative values (900.7 m) to 562 m postoperatively. Evidence of side healing was documented by OCT. One patient had a double AC, one patient had an air interface entrapment "Double Bubble," one patient had a fungal infection and was treated by a therapeutic penetrating keratoplasty, and one patient had a CMO.

CONCLUSION: Femtolaser-assisted DSAEK may be superior to manual techniques as it offers better centration, thinner graft/host complex, earlier corneal detergecense, and stronger healing. This study was registered at with a UID: researchregistry2274.

Youssef, M. M., D. El-Fayoumi, M. K. Sidky, A. I. Hegazy, huda marzouk, and R. M. Eltanamly, "Value of Microperimetry in Detecting Early Retinal Toxicity of Hydroxychloroquine in Children with Juvenile Systemic Lupus Erythematosus.", Ophthalmologica. Journal international d'ophtalmologie. International journal of ophthalmology. Zeitschrift fur Augenheilkunde, 2017 Mar 16. Abstractophthalmologica_.pdf

PURPOSE: To evaluate retinal sensitivity in children who are on hydroxychloroquine (HCQ) for systemic lupus erythematosus using microperimetry and compare the results with those of the Humphrey visual field (HVF) 10-2 and spectral-domain optical coherence tomography (SD-OCT).

PROCEDURE: A case-control cross-sectional study including 19 patients (less than 18 years old) on HCQ for at least 5 years. Controls were 21 normal children. Participants underwent a complete ophthalmic examination, then were investigated using HVF 10-2, SD-OCT, and microperimetry.

RESULTS: Ocular examination revealed no abnormalities. The overall mean microperimetry sensitivity of the patients (15.75 dB) was not significantly different from that of the controls (16.35 dB). The HVF 10-2 showed a significant difference in the mean deviation of the patients. Conclusions and Message: Microperimetry was not more revealing than HVF 10-2 and SD-OCT. Larger studies are required to compare the diagnostic accuracy of screening modalities of retinal toxicity in children on HCQ.