mohammad ghasemi health research center, baqiyatallah university of medical sciences, tehran, ir iran seyed hosein hoseini yazdi contact lens and visual optics laboratory, school of optometry and vision science, queensland university of technology, brisbane, australia; contact lens and visual optics laboratory, school of optometry and vision science, queensland university of technology, brisbane, australia. tel: +61-731385716, fax: +61-731385880 javad heravian department of optometry, paramedical faculty, mashhad university of medical sciences, mashhad, ir iran ebrahim jafarzadehpur contact lens and visual optics laboratory, school of optometry and vision science, queensland university of technology, brisbane, australia maryam rezaee trauma research center, baqiyatallah university of medical sciences, tehran, ir iran