English: R’ Chama bar R’ Chanina said: In the days of our fathers the yeshivah never ceased from them. Yaakov was an elder and sat in the yeshivah, as it is written: “And the eyes of Yisrael were dim for age.”
On the daf / in context: The phrase is read as an asmachta that the dimming of the eyes came from the labour of Torah study. The fathers maintained continuous houses of study; Yaakov in his old age was still occupied with Torah.
Type of Learning
Asmachta / aggadic derash — “כבדו מזקן” is understood as the result of intensive Torah labour rather than ordinary physical senescence.
What Is Learned
The patriarchs maintained uninterrupted yeshivos. Yaakov’s dimmed eyesight is taken as evidence of lifelong devotion to Torah study.