RESUMO
PURPOSE: To determine near and intermediate vision areas of progressive addition lenses by means of a deflectometer. METHODS: Twenty-two progressive addition lenses with +1.00 SD far power and two different additions (add 1.00 and 2.00; eleven subjects in each addition) were studied. Near and intermediate vision areas within 0.50 CD isoastigmatic lines were determined. RESULTS: There are significant differences between near and intermediate vision areas of the studied lenses. There is also an inverse correlation between the addition and intermediate areas as well as direct relation between the vertical length of the corridor and its area. CONCLUSION: Based on those findings, progressive addition lenses can be selected to suit the wearer's visual requirements.
Assuntos
Óculos/normas , Fenômenos Ópticos , Desenho de Equipamento , Interferometria/métodosRESUMO
OBJETIVO: Avaliar a potência do astigmatismo induzido nas lentes progressivas em um deflexômetro. MÉTODOS: Foram incluídas onze lentes progressivas com poder longe de +1,00D e adição 2,00D para perto. Avaliou-se o astigmatismo induzido em doze pontos do campo intermediário, sendo seis de cada lado do corredor progressivo no deflexômetro. RESULTADOS: Existem diferenças significativas entre as somas dos astigmatismos induzidos de cada lado do corredor progressivo e no total geral nestas lentes estudadas, com coeficiente de variação com forte dispersão (CV 10 a 13%). CONCLUSÃO: Existe uma variação importante das potências dos astigmatismos induzidos nas lentes progressivas...
OBJECTIVE: Evaluate induced astigmatism in progressive addition lenses into deflectometer measurements. METHODS: Eleven progressive addition lenses were included with power away from +1.00D and addition 2.00D. Induced astigmatism was assessed twelve points in the zone intermediate, with six on each side of the progressive corridor in deflectometer. RESULTS: There are significant differences between the sums of induced astigmatism on each side of the corridor and in the general in progressive addition lenses studied, with coefficient of variation with strong dispersion (CV 10-13%). CONCLUSION: There is an important variation of the power of induced astigmatism in progressive addition lenses...
Assuntos
Humanos , Astigmatismo , Equipamentos e Provisões , Lentes , Topografia de Moiré/métodos , BrasilRESUMO
OBJETIVO: Avaliar por deflexometria as diferentes regiões das lentes progressivas e determinar as áreas dos campos de visão intermediário e de perto. MÉTODOS: Foram incluídas vinte e duas lentes progressivas com poder +1,00 DE para longe e duas adições diferentes (adição 1,00 e 2,00, 11 de cada). Mediram-se as áreas dos campos intermediário e de perto entre as isoastigmáticas de 0,5 DC. RESULTADOS: Encontraram-se diferenças significativas entre as áreas dos campos intermediário e de perto das lentes estudadas. Entre a área do campo intermediário e a adição observou-se correlação inversa; entre a área do campo intermediário e a extensão vertical do corredor encontrou-se correlação direta. CONCLUSÃO: Com esses dados permitem-se recomendar as lentes de acordo com o campo de maior necessidade visual de cada usuário.
PURPOSE: To determine near and intermediate vision areas of progressive addition lenses by means of a deflectometer. METHODS: Twenty-two progressive addition lenses with +1.00 SD far power and two different additions (add 1.00 and 2.00; eleven subjects in each addition) were studied. Near and intermediate vision areas within 0.50 CD isoastigmatic lines were determined. RESULTS: There are significant differences between near and intermediate vision areas of the studied lenses. There is also an inverse correlation between the addition and intermediate areas as well as direct relation between the vertical length of the corridor and its area. CONCLUSION: Based on those findings, progressive addition lenses can be selected to suit the wearer's visual requirements.
