مؤسسة الشرق الأوسط للنشر العلمي
عادةً ما يتم الرد في غضون خمس دقائق
AIM:- to know design and how the PALs works , determine the relationship between the size of PALs and visual field of addition ,distance and corridor , difference between brands of PALs ,make comparison between the most common lenses METHOD:- collection of lenses from different brands and measure them by (AL700 automatic lensometer) by changing the setting to PALs measure in order to determine the all information about it and how to make the fitting in many points to avoid any vision problems RESULT:- found a linear relationship between the size of PALs the field of addition . and where increaseing the sphere and cylinder the addition power decrease