Differences in refractive astigmatism, anterior corneal surface astigmatism and ocular residual astigmatism between dominant and non-dominant eyes in myopia / 中华实验眼科杂志

Objective:To investigate the differences in refractive astigmatism, the anterior corneal surface astigmatism and ocular residual astigmatism between dominant and non-dominant eyes in myopia.Methods:A corss-sectional study was conducted.Two hundred and seventy-six eyes from 138 patients with myopia who were to receive corneal refractive surgery in the Refractive Surgery Center of Tianjin Eye Hospital from January to March 2018 were included.Ocular dominance was assessed with the hole-in-the-card test.The manifest refraction and corneal topography were performed in order to measure the sphericity, spherical equivalent, the astigmatism of anterior corneal surface and total cornea.Vector analysis was used to calculate the value of the ocular residual astigmatism and the components of astigmatism, including J0 and J45 of both the refractive astigmatism and the astigmatism of anterior corneal surface.This study adhered to the Declaration of Helsinki.The study protocol was approved by the Ethics Committee of Tianjin Eye Hospital (No.201909).Results:It was found that 61.6%(85/138) of the subjects was right-eye dominant.There was no significant difference in sphericity and spherical equivalent, J0 and J45 of the refractive astigmatism and the astigmatism of anterior corneal surface between dominant and non-dominant eyes (all at P>0.05). The magnitude of the ocular residual astigmatism of the dominant eye was 0.607(0.451, 0.808)D, which was lower than 0.701(0.497, 0.901)D of the non-dominant eye, showing a statistically significant difference ( Z=-2.52, P=0.01). Conclusions:In the myopic population with no significant difference in the sphericity and spherical equivalent between the dominant and non-dominant eyes, the magnitude of the ocular residual astigmatism of the dominant eye is significantly lower than that of the non-dominant eye, which may play an important role in the ocular dominance formation.

Macular thickness and retinal nerve fiber thickness analysis in ocular dominance / Espessura macular e fibra nervosa da retina análise de espessura no domínio ocular

Abstract Objective: To compare macular and peripapillary retinal nerve fiber layer thicknesses of dominant eye and non-dominant eye using optical coherence tomography (OCT). Methods: 104 eyes of 52 healthy young adults were included. Ophthalmological examinations; including measuring refraction, best corrected visual acuity, intraocular pressure (IOP) measurement, slit-lamb biomicroscopy, dilated fundus examination, measuring of central macular thickness (CMT), and peripapillary retinal nerve fiber layer (PRNFL) thickness were performed on each subject. Hole-in-the-card test was used to detect the ocular dominance. Results: There were 25 females (48%) and 27 males (52%) in the study. Eight participants had left eye dominance (15%), forty-four participants had right eye dominance (85%). Mean CMT was 192.5µm in dominant group and 191.9 µm in non-dominant group. There was no statistically significant difference between dominant eye group and non-dominant eye group in either macular thickness or peripapillary retinal nerve fiber layer thickness. Conclusions: No difference between macular and peripapillary retinal nerve fiber layer thicknesses were detected in dominant and non-dominant groups. Further evaluation is needed.

Resumo Objetivo: Comparar as espessuras da camada de fibras nervosas da retina macular e peripapilar do olho dominante e não dominante usando a tomografia de coerência óptica (OCT). Métodos: 104 olhos de 52 adultos jovens saudáveis foram incluídos. Exames oftalmológicos; incluindo medidas de refração, melhor acuidade visual corrigida, medição da pressão intraocular (PIO), biomicroscopia de fenda-cordeiro, exame do fundo dilatado, medição da espessura macular central (CMT) e espessura da camada de fibras nervosas da retina peripapilar (PRNFL) foram realizadas em cada sujeito. O teste Hole-in-the-card foi usado para detectar a dominância ocular. Resultados: houve 25 mulheres (48%) e 27 homens (52%) no estudo. Oito participantes tinham deixado a dominância do olho (15%), quarenta e quatro participantes tinham dominância do olho direito (85%). A CMT média foi de 192,5 µm no grupo dominante e 191,9 µm no grupo não dominante. Não houve diferença estatisticamente significativa entre o grupo dominante de olho e o grupo de olho não dominante tanto na espessura macular quanto na espessura da camada de fibras nervosas da retina peripapilar. Conclusões: Não houve diferença entre as espessuras das camadas de fibras nervosas da retina macular e peripapilar nos grupos dominante e não dominante. Mais avaliações são necessárias.

Artificial pupil versus contralateral balanced contact lens fit for presbyopia correction / Pupila artificial vs adaptação contralateral equilibrada de lentes de contato para correção da presbiopia

Purpose: To assess and compare the effects of contact lens-based artificial pupil design and contralateral balanced multifocal contact lens combination (CBMCLC) on visual performance. Methods: This randomized crossover study conducted at the University of Valencia, Spain included 38 presbyopic patients using an artificial pupil contact lens in the nondominant eye and a CBMCLC. After a month of lens wear, the binocular distance visual acuity (BDVA), binocular near visual acuity (BNVA), defocus curve, binocular distance, and near contrast sensitivity and near stereoacuity (NSA) were measured under photopic conditions (85 cd/m2). Moreover, BDVA and binocular distance contrast sensitivity were examined under mesopic conditions (5 cd/m2). Results: Visual acuity at an intermediate distance and near vision was better with the CBMCLC than with the artificial pupil (p<0.05). Statistically significant differences were found in contrast sensitivity between the two types of correction for distance (under mesopic conditions) and for near vision, with the CBMCLC exhibiting better results in both cases (p<0.05). The mean NSA values obtained for the artificial pupil contact lens were significantly worse than those for the CBMCLC (p=0.001). Conclusion: The CBMCLC provided greater visual performance in terms of intermediate and near vision compared with the artificial pupil contact lens. .

Objetivo: Avaliar e comparar os efeitos da pupila artificial baseada em lentes de contato e a combinação equilibrada de lente de contato multifocal contralateral (CBMCLC) sobre o desempenho visual. Métodos: Estudo realizado na Universidade de Valência, Espanha. Em um projeto de estudo do tipo "cross-over", 38 pacientes présbitas foram avaliados utilizando uma lente de contato com pupila artificial no olho não-dominante e CBMCLC. Após 1 mês, foram avaliadas, em condições fotópicas (85 cd/m2), a acuidade visual binocular para distância (BDVA), a acuidade visual binocular para perto (BNVA), a curva de desfocagem, a sensibilidade ao contraste binocular para distância e para perto, assim como a acuidade estereoscópica para perto (NSA). Além disso, a BDVA e a sensibilidade ao contraste binocular para distância foram avaliadas em condições mesópicas (5 cd/m2). Resultados: A acuidade visual em distâncias intermediárias e para perto foram melhores com CBMCLC do que com pupila artificial (p<0,05). Foram encontradas diferenças estatisticamente significativas entre a sensibilidade ao contraste com os dois tipos de correção para distância (em condições mesópicas) e para perto, com CBMCLC ser melhor em ambos os casos (p<0,05). Os valores médios da NSA obtidos com as lentes de contato das pupilas artificiais foram significativamente piores do que com CBMCLC (p=0,001). Conclusão: CBMCLC proporciona melhor desempenho visual para visão intermediária e para perto do que a lente de contato com pupila artificial. .

The correlation of dominance eye and dominance hand in juvenile myopia / 中国医师进修杂志

Objective To study the correlation of dominance eye and dominance hand in juvenile myopia.Methods Three hundred and twenty-seven clinical myopia eases were collected and tested the dominance eye by the simplified hole-in-the-bend method.The dominance hand was determined by medical history of every ease.The correlation between the dominance eye and the dominance hand was analyzed with the Pearson test of SPSS 15.0 software.Results The rate of right dominance eye was 64.5% in all 327 eases,and the left was 33.5%.Three hundred and nineteen in 327 eases were right dominance hand,and the other 8 cases were left dominance hand.There were 211 eases with both dominance eye and dominance hand at right side.The index of Pearson correlation between dominance eye and dominance hand was 0.214,P＜0.05.Conclusions Both dominance eye and dominance hand are at the same side in most cases.The correlation of dominance eye and dominance hand in juvenile myopia is significant.