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Summary The study aimed to identify the type of refraction in children with unilateral and bilateral congenital nasolacrimal duct obstruction (CNLDO) who underwent nasolacrimal duct probing. One hundred and twelve children aged 1.8 to 13 years, diagnosed with CNLDO, were included in a retrospective study. All the patients had their visual acuity examined, and their refractive status was evaluated. The refractive errors of both eyes were noted, followed by an appropriate management plan. Of the 112 children, 79 (70.5%) had a unilateral obstruction, and 33 (29.5%) had bilateral obstruction. Nine children (11.4%) in the former group and six children (18.2%) in the latter group were with visual acuity 0.05) between refraction of the two eyes in the evaluated children were found. Amblyopia risk factors were identified in 9 of the patients (8.0%). CNLDO did not adversely affect the refractive status. However, amblyogenic risk factors were found more often in our patients, as compared to general populations. Therefore, a detailed evaluation should be performed to find out these risk factors.

Purpose: To discuss the various epidemiological aspects and the impact risk factors for developing CNLDO in children. Material/Methods: An analytical observational case-control study. Оne hundred and thirteen children diagnosed and probed for CNLDO in Eye clinic-Pleven were included in a case group. A control group consisted of 121 children without CNLDO. All of the parents answered questions from specially designed questionnaires related to the pregnancy of the mother, antenatal risk factors and child’s health in the neonatal period. Results: The demographic profile of the evaluated children in the case group was: 49.6% males and 50.4% females; 33% cases were with affected right eye, 37% left eye, and 30% individuals with bilateral CNLDO after birth. Median gestational age of the children with CNLDO was 40.0. Risk factors for CNLDO development are antibiotics intake and consuming alcohol during the pregnancy. Conclusion: Congenital nasolacrimal duct obstruction affects full-term born children. Detection of the risk factors for developing CNLDO will improve methods for the prevention of this disease.

Aim: To determine the success rate of initial and repeated probing for congenital nasolacrimal duct obstruction (CNLDO) in children between 2-41 months. Patients and methods: One hundred and twelve children aged 1.8 to 13 years responded to the control examination. They were diagnosed with CNLDO in the past and now included in a retrospective study. The mean follow-up period was 5.2 years (from 0.6 to 11.6 years). Patients were divided into two groups according to their age at the time of surgery: group A (2-12 months) and group B (13-41 months). Probing and irrigation of NLD was performed in the Eye Clinic in Pleven under general anesthesia in all subjects. A controlled examination was done to evaluate the effect of probing on the basis of a history of watery eyes, regurgitation test, and dye disappearance test (DTT). Results: Of the 131 eyes in 112 children, 110 eyes (84%) had one probing and 21 eyes (16%) had repeat probing. Success rate of the initial probing was 90% (99 of 110) for all patients’ eyes: 89% (70 of 79) in group A and 94% (29 of 31) in group B. The cure rate of the repeat probing was 76% (16 of 21) for all patients: 88% (7 of 8) in group A and 69% (9 of 13) in group B. The overall success rate of probing was 88% (115 of 131). Conclusion: Nasolacrimal duct probing followed by irrigation is a commonly performed, highly successful treatment for congenital nasolacrimal duct obstruction in children. The success rate for initial and repeated nasolacrimal duct probing is not affected by age.

SUMMARY Purpose: To detect visual disturbances, major symptoms and relationship between them in children between the ages of 3 and 6 years, who spend some time in front of a computer. Material/Methods: In the present study 2823 children attending 23 kindergartens in the city of Pleven, were given inquiry cards. Those with completed questionnaires were examined for visual acuity and convergence. In cases with low vision the children were invited for a detailed eye examination in the Eye Clinic at the University Hospital “Dr G. Stranski” - Pleven. Results: A total of 2332 children responded and were examined (1174 girls and 1158 boys). The age of children is from 3 to 6 years. We found 303 children with subjective complaints in a close work, 163 with low vision and 18 with impaired convergence. Regarding the duration of stay in front of a computer – 159 children stay over 3 hours a day in front of video display, 1228 children spend about 1 hour a day in front of a computer and 945 children do not play on a computer. Conclusion: Nowadays more and more children use computers for recreational purposes at home. From our study it became clear that preschool children overuse their stay in front of computer.