Abstract Neuromorphic vision functionalities have been realized by coupling quasi-bound states in the continuum (quasi-BICs) to multiple quantum wells (MQWs). The engineered leaky modes enhance infrared absorption and generate coexisting nonlinear and linear photoresponses that support image preprocessing and in-sensor computing. This approach highlights a new role for quasi-BIC leakage in integrated optoelectronic intelligence. Biological vision systems perform substantial information processing before signals reach the brain1. Within the retina, operations such as contrast enhancement, noise suppression and feature extraction are executed locally, reducing the computational burden of higher visual centers and enabling highly efficient perception. Reproducing such front-end processing capabilities in artificial hardware has become a central objective of neuromorphic vision technologies, which seek to overcome the latency and energy costs associated with conventional von Neumann architectures where sensing and computation are physically separated2,3. Among various optoelectronic platforms, multiple quantum wells (MQWs) provide a promising route for infrared neuromorphic vision systems due to their strong quantum confinement effects, fast carrier dynamics, and compatibility with mature semiconductor fabrication technologies4,5,6,7. These structures have been widely explored in infrared imaging, optical communication, and sensing applications, making them attractive candidates for in-sensor visual processing8,9,10. However, the optical response of MQWs is fundamentally governed by intersubband selection rules, which require a dominant out-of-plane electric-field component to efficiently drive carrier transitions11,12. As a result, the absorption efficiency under normal incidence is intrinsically limited, posing a critical challenge for direct integration into compact imaging systems. To overcome this limitation, a variety of photonic coupling strategies have been explored. Metallic gratings were introduced to provide the required out-of-plane electric-field component under normal incidence13, while plasmonic resonators14 and metamaterial absorbers15 were subsequently employed to enhance local electromagnetic fields and improve detector responsivity. More recently, metasurfaces have emerged as a versatile platform for tailoring light–matter interactions in MQWs through engineered