>>8042922
Your questions gave me an idea: maybe this is a genetic abnormality common to that specific ethnic group.
A commonly-known disorder is Tay-Sachs disease. Another possibility is injury from botched circumcision.
https://rarediseases.info.nih.gov/diseases/6866/bardet-biedl-syndrome
"Bardet-Biedl syndrome (BBS) affects many parts of the body. Signs and symptoms can vary among affected individuals, even within the same family. The major features include:[4][5][6]
Progressive vision loss due to deterioration of the retina. This usually begins in mid-childhood with problems with night vision, followed by the development of blind spots in peripheral vision. Blind spots become bigger with time and eventually merge to produce tunnel vision. Most individuals also develop blurred central vision and become legally blind by adolescence or early adulthood (over 90% of cases).
Extra finger next to the pinky (postaxial polydactyly)
Kidney problems (polycystic kidneys)
Obesity that develops around 2-3 years of age
Abnormalities of the genitalia and infertility due to hypogonadism"
They actually have addressed this topic:
https://www.tabletmag.com/jewish-life-and-religion/187781/kirsch-daf-yomi-110
Finally, this (includes plenty of new vocabulary words, omg)
https://en.wikipedia.org/wiki/Disorders_of_sex_development
Reading all this made me feel as if I'd won some kind of genetic lottery, just for being plain and normal.
Yikes.