Effect of refractive errors on the results of botulinum neurotoxin administration in patients with infantile esotropia.

PURPOSE: To investigate the effect of refractive errors on the results of patients followed up with infantile esotropia (IE) and treated with botulinum neurotoxin (BNT) injection. METHODS: The files of patients with IE who presented to the ophthalmology pediatric ophthalmology unit and underwent BNT injection into both medial rectus muscles between 2019 and 2021 were reviewed retrospectively. Sixty eyes of 30 patients were included in the study. Patients with additional systemic or ocular diseases and those with a history of ocular surgery were excluded. Distance and near deviations were measured (with the prism cover test or Krimsky method) before and at the first, third, and sixth months after BNT injection. RESULTS: In Group 1 (n = 20) with a spherical equivalent of + 2.0 diopters (D) or less, the mean near and distance deviation value was both 36.8 ± 12.7 prism diopter (PD) before injection. In Group 2 (n = 10) with a spherical equivalent of above + 2.0 D, the near deviation was measured as 35.0 ± 7.1 PD and distance deviation as 31.8 ± 7.9. At six months after BNT injection, the near and distance deviation values were 20.6 ± 12.3 and 20.6 ± 11.6 PD, respectively in Group 1 and 10.1 ± 10.3 and 8.8 ± 10.8 PD, respectively in Group 2. The change in deviation did not statistically significantly differ between the groups (p > 0.05), but the distance and near deviation values were lower in Group 2 at sixth months after BNT injection. CONCLUSIONS: BNT injection is a preferred method in IE. Higher hypermetropic values seem to increase the success of BNT injection.

Pulled-in-two syndrome in strabismus surgery for congenital fibrosis of the extraocular muscles.

Purpose: The aim of this study is to present six cases of pulled-in-two syndrome (PITS) in strabismus surgeries and to discuss our prevention and management strategies. Methods: This is a retrospective study presenting cases of PITS during strabismus operations. The medical records of the subjects who underwent operation in the strabismus unit of Beyoglu Eye Training and Research Hospital were reviewed retrospectively, from January 2000 till March 2022. Detailed ophthalmological examination records and angle of deviation were noted. Results: A total of six cases (four males and two females) with a mean age of 37.2 ± 28.0 (min 9-max 71) years were included in this study. All of the cases had congenital fibrosis of extraocular muscles (CFEOM). The most commonly involved muscle was medial rectus (83%). Majority of cases (67%) were adults. In all cases, the muscle was found and reattached to the globe. No patients had diplopia after surgery. Conclusion: PITS is a rare complication that can be seen during strabismus surgeries, and CFEOM patients are in the risk group. Therefore, surgeons should be cautious and prepared in risky patients to be able to manage this complication.

TRANSCORNEAL ELECTRICAL STIMULATION THERAPY MAY HAVE A STABILIZATION EFFECT ON MULTIFOCAL ELECTRORETINOGRAPHY FOR PATIENTS WITH RETINITIS PIGMENTOSA.

PURPOSE: To assess the effects of transcorneal electrical stimulation (TES) on several measures of visual function in retinitis pigmentosa. METHODS: This prospective, randomized, fellow-eye-controlled study includes 30 eyes of 15 patients with retinitis pigmentosa. Each patient's eyes were randomly selected as treatment (TE) and control eye (CE), and 30 minutes/week TES was applied for 6 months. Patient evaluations were performed before and after TES, including comprehensive ophthalmological examination, visual fields, full-field and multifocal electroretinography, microperimetry, and optical coherence tomography. All parameters were compared before and after TES and between TE and CE. RESULTS: After TES, the mean signal amplitudes in multifocal electroretinography were stabilized in TE. The mean signal amplitudes in CE decreased in every ring, reaching significance in the fifth ring (847.15 ± 393.94 and 678.77 ± 282.66 nV, P = 0.039, before and after TES, respectively). The changes in the mean signal amplitudes of TE and CE were -0.38 ± 295.53 and -185.15 ± 332,62 nV in second (P = 0.046), 36.69 ± 326.4 and -143.38 ± 317,41 nV in fourth (P = 0.028), and -17.46 ± 333.07 and -168.38 ± 297,14 nV in fifth rings (P = 0.046), respectively. The decrease in the mean signal amplitudes between 2° and 20° midperipheral retina was significantly less in TE (-33.59 ± 225,1 nV) than CE (-205.56 ± 345.1 nV) (P = 0.011). There were no significant changes in other parameters. CONCLUSION: The progression in multifocal electroretinography might be stabilized with TES. Further studies with larger sample sizes and a longer follow-up are needed to conclude that TES reduces retinitis pigmentosa progression.

Impact of Changes in the Optical Density of Postlens Fluid on the Clinical Performance of Miniscleral Lenses.

PURPOSE: To determine the impact of optical density changes in postlens fluid on clinical performance and to quantify these changes over time during miniscleral lens wear. METHODS: Twenty-three eyes of 13 patients with keratoconus were fitted with a miniscleral lens (scleral Misa lenses; Microlens Contactlens Technology, Arnhem, Netherlands). The lens fit was evaluated using the fluorescein pattern and also through anterior segment optical coherence tomography imaging. The optical density changes were measured using Scheimpflug tomography at 30 min, 1, 2, 3, and 4 hr. High- and low-contrast visual acuity (VA), subjective performance with comfort and vision (5-point Likert scale), and overall satisfaction with the lens (100-mm visual analog scale) were measured before and after lens-wear. RESULTS: The mean Snellen high-contrast VA (best spectacle-corrected VA: 0.4±0.2 vs. VA with the scleral lens: 0.8±0.1, P<0.0001) and low-contrast VA (best spectacle-corrected VA: 1.2±0.2 vs. VA with the scleral lens: 1.3±0.2, P=0.019) significantly improved with dispensed scleral lens. Patients reported high scores for comfort (3.8±0.8), vision (3.8±0.6), and overall satisfaction with the lens (68.7±19.1). Compared with preoperative values, optical density significantly increased over time (P<0.0001). High-contrast VA remained stable, whereas low-contrast VA significantly decreased at 2 hr (P=0.035). CONCLUSION: This study shows that the optical density of postlens fluid increases over time with miniscleral lens wear, and it has a negative impact on low-contrast VA.