Final answer:
Without specific details, it's not possible to determine when Erik lost his sight; however, nearsightedness is common in school-age children, frontal lobes develop by age 25, sexual orientation awareness starts in early adolescence, and binocular vision cells can activate later in life.
Step-by-step explanation:
The question "When did Erik lose his sight?" presumably refers to an individual named Erik and details about his life, possibly from a case study, a book, or another narrative. Without more specific information, it is difficult to provide an accurate answer to this. However, if this question were grounded in general knowledge about the development of eyesight and common patterns of vision loss, I can share related information which might help in understanding the context better. For instance, nearsightedness, a common vision condition, often first occurs in school-age children and may progress until about the age of 20. However, significant sight loss at different life stages could be due to various factors, including health conditions, trauma, or genetic predispositions.
Regarding the development of the frontal lobes, they are known to be fully developed by 25 years old. Sexual orientation awareness typically begins in early adolescence. Moreover, referring to the provided extract on Bruce's case, it is intriguing that the cells in the visual system tuned to binocular cues can be activated much later in life, as indicated by Bruce's experience of nearly 70 years before such activation.
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