وفّر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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هي عين اصطناعية تمنح الدماغ الأحاسيس البصرية. وتتألف من أنظمة إلكترونية بها مستشعرات للصور ومعالجات دقيقة وأجهزة استقبال وأجهزة إرسال لاسلكية وشرائح شبكية.
توفر العين الإلكترونية رؤية تختلف عن الرؤية التي اعتاد الإنسان امتلاكها. ورغم أنها لا تمنح الرؤية كاملة، لكن تمكن نحو نصف المكفوفين باستخدام العين الإلكترونية من قراءة أحرف كبيرة جداً يبلغ ارتفاعها نحو 22 سم من مسافة 0.3 متر.
وتمكن عدد قليل من المكفوفين من قراءة الأحرف الصغيرة التي يبلغ ارتفاعها نحو 2.5 - 5 سم عند رؤيتها من مسافة 0.3 متر.
تعمل بشكل مشابه للعين البشرية، حيث تحصل على صور من الكاميرا المركبة على نظارة الكفيف، وتكون الكاميرا صغيرة الحجم لأنها تلائم الإطار الزجاجي للنظارة.
ثم يتم إرسال الصورة إلى مجموعة شرائح إلكترونية صغيرة تعمل كمعالج دقيق. إذ يتمثل عمل المعالج الدقيق في تحويل بيانات الصورة إلى إشارة إلكترونية ونقلها إلى المستقبل، إذ يرسل إشارات من خلال كابل صغير جداً إلى لوحة إلكترود يزرعها الأطباء على الجدار الخلفي للعين والتي تسمى أيضاً شبكية العين.
ثم تنتقل عبر العصب البصري إلى الدماغ على شكل نبضات. وعندما تصل الإشارة إلى الدماغ، يبدأ الدماغ في فك تشفير الإشارة ويمكن بذلك تحديد ماهية الصورة.
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