# RKS: LIGHT & LUMINATION - Enlightening About Brightness Intensities
# RKS: LIGHT & LUMINATION ENLIGHTENING ABOUT BRIGHTNESS INTENSITIES RKS / 2025-2026 / Ser 8 / Blog 3 1st December 2025 REVEALING SEEING DYNAMICS THE RETINA & ILLUMINATING Dear Reader, Seeing light is taken for granted. Seeing images, objects and beauty is what the eyes are meant for. However, the mechanisms that lie behind what makes one see and perceive are indeed intriguing and worth understanding to appreciate the miracle of sight that has been bestowed to living beings. EYE - RETINA - VISION There are three layers of tissues in the eye and retina is the innermost and forms the curtain. Fig: Layers of eye. The retina of the eye has rods, cones and intrinsically photosensitive retinal ganglion cells (ipRGCs). All these 3 types are sensory nerve cells (neurons) that sense light and also called photoreceptors. These specialized neurons detect light and convert it to electrical signals which the brain interprets. Fig: Cells of retina. Rods are 500 to 1,000 tim...