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Dispensing case study – Heights matter beyond the multifocal

A young patient’s slanted posture was noted – only when asked he admitted he was in this painful position most of the time “So I can see.” On checking the spectacles sourced overseas, no heights had been allowed for, producing 12 D of base down prism in both eyes. To neutralise this, the patient was placing himself in a head-up position to look through the optical centre of the lens. | more

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Dispensing case study – Prisms are no yoke

A nine-year-old boy who had previously worn single vision distance glasses for the past four years. His parents were aware of his complaining of tired and sore eyes, especially following prolonged use of digital devices. This case study discusses recommendations for bifocals with yoked prisms versus recommending reduced use of digital devices. | more

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Dispensing case study – Progressive lenses and isocylinder plots

Various lens parameters will vastly impact the progressive lens design and so this should be considered when selecting a lens for the patient. The use of isocylinder plots can assist with this –however, the plots provided by manufacturers often show a plano prescription with a +2.00 addition and so are not a true representation of the lens. This case study shows the impact of the varying lens parameters and will allow you to assess whether the use of isocylinder plots during lens selection is the most effective tool. | more