proposta para uma visão clínica das lentes progressivas purpose to a clinical view of the progressive addition lenses

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ID: 143177
2008
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Abstract
OBJETIVOS: Estudar as lentes progressivas, à luz da óptica fisiológica, para mostrar os achados obtidos no lensômetro e a sua aplicabilidade na prática diária. MÉTODOS: Depois de explicar a forma de examinar as lentes, foram indicadas as bases físicas que permitiram o estudo, sendo levados em conta as variações do sistema prismático das lentes convexas e côncavas, as diferenças na extensão da zona de progressão e a razão da sua posição diagonal. O estudo foi realizado com 13 pares de lentes de uma mesma empresa e cobrindo todos os desenhos de lentes que ela disponibilizava na época do estudo.Todas as lentes tinham 2 D para longe (uma lente côncava e outra convexa) e as suas adições eram de 2 D. RESULTADOS: As lentes progressivas convexas têm na sua correção para longe um prisma de base inferior que depois de apresentar um local sem prisma passa a exibir um prisma de base superior. As lentes côncavas têm prisma de base inferior crescente.Ambas sofrem um desvio vertical médio, na amostra, de 5,86º, nas lentes convexas, e 6,93º nas lentes côncavas. CONCLUSÃO: Os autores, baseados nos achados, mostram os fatores que devem ser levados em conta no exame das lentes progressivas para minimizar a insatisfação ao uso dessas lentes. Nos estudos das lentes progressivas é considerado como primeiro plano a progressão sobre o plano secundário dos valores dióptricos enquanto nesse trabalho é considerado principal o valor dióptrico e a progressão secundária.
PURPOSE: This is to study the progressive addition lens (PAL) under the physiological optics' view, to show the lensometer findings and its applicability to daily work. METHODS: At first, the aa., explains the ways to examine the PAL , and then indicates the physical basis applied to study the prismatic system of the concave and convex lens. It then examines the differences on progression zone extension and explains its diagonal position. Thirteen pairs of lenses from the same manufacturer were examined but every pair had different drawing.The whole (convex and concave lens) had 2 Spherical Dioptries (SD) to distance and an addition of 2 SD. RESULTS: The convex PAL have to distance correction Inferior Base prism that do lower in progression zone to the point of no prism, and then continues with an increasing Superior Base prism to reach the near correction.The concave PAL has an Inferior Base prism rising constantly to near correction. Both have a mean vertical deviation in the sample of 5,86º in the convex lenses and 6,93º in the concave lenses. CONCLUSION: The aa., based on these findings, shows the most important data to watch in the PAL to minimize the complaints concerning its usage. The studies about PAL highlight that the dioptric values are the background of the progressive zone, and the aa. concludes that the dioptric values are the principal factor and, the progressive zone secondary.
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Authors ;Fernando Queiroz Monte;Cleanto Jales de Carvalho Filho
Journal the european journal of neuroscience
Year 2008
DOI
10.1590/S0034-72802008000200004
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-72802008000200004
Keywords
comparative study models visual acuity theoretical lenses

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