Your Inner Fish Part 4

What did you think of the reading?

Neil Shubin has outdone himself with Your Inner Fish. He was able to simultaneously present facts and knowledge of various topics concerning the structure of the body while entertaining the reader. The linkages between humans and seemingly distant species were truly fascinating to learn and left me in awe of nature’s complexities.

What did you learn from the reading?

Shubin had shed considerable light in his explanation of why the human eye loses acute vision in the dark, only to regain it shortly after. I have been taught that the pupil dilates when the intensity of light has changed in a dark room, but I was unaware of the role opsin proteins played in the phenomena. The hiatus in vision is caused by the absence of opsins in their normal state, who take time to recharge after changing shape in response to light.

What questions do you still have?

If opsins have been determined as the primary photopigment in the eye, can opsins be injected or supplied to a color-blind person and correct the deficiency?


One thought on “Your Inner Fish Part 4

  1. Although transplanting opsins , in the case of a a blind individual, could potentially correct their dysfunctional vision, the difficulty would be obtaining the opsin for injection.As opsin, a photopigment, is active in photoreceptor cells in the retina, it must be extractable from the rods and cones in the former without causing harm to the donor, which is improbable.Furthermore, their are other photoreceptor proteins which contribute to proper vision, and in general lack of photopigments is directly relatable to lack of functional photoreceptor cells in the retina, rods and cones, which are not regeneratable as nerve cells.Therefore, if able to accumulate opsin, it itself is unlikely to repair the deeper afflictions often of the character of malformation and degeneration of rods and cones which plague the colorblind.

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