In the normal visual pathway, light travels through the tear film, cornea, aqueous, pupil, lens, and vitreous, to activate the light sensitive photoreceptors and set up the trans-synaptic connections of the retina (Fig.1). In cases where there is gross destruction of the eye like phthisis bulbi, restoration of vision is not possible. But in conditions where blindness is due to a disease in the photoreceptors in the retina like Retinitis Pigmentosa (RP) (Fig. 2) or Age Related Macular Degeneration (AMD) (Fig.3 a,b) wherein the neural connections are intact, in cortical tumours and lesions involving the visual pathways or occipital cortex wherein the photoreceptors are intact, there exists a scientific possibility wherein a device can be implanted at any location in this pathway to set up a neuronal electrical stimulation.
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