Automated charting of the visual space of insect compound eyes

TL;DR

This paper introduces an automated method to map the spatial organization of insect compound eyes' visual axes using the pseudopupil phenomenon, aiding in understanding their visual resolution and neural processing.

Contribution

It presents a novel automated procedure for measuring the spatial arrangement of visual axes in insect compound eyes, utilizing optical phenomena and experimental setup.

Findings

Successfully mapped the visual axes of a housefly's compound eye.

Demonstrated the effectiveness of the automated measurement procedure.

Provided insights into the spatial resolution of insect compound eyes.

Abstract

This paper describes the automatic measurement of the spatial organization of the visual axes of insect compound eyes, which consist of several thousands of visual units called ommatidia. Each ommatidium samples the optical information from a small solid angle, with an approximately Gaussian-distributed sensitivity (half-width of the order of one degree) centered around a visual axis. Together, the ommatidia gather the optical information from virtually the full surroundings. The spatial distribution of the visual axes thus determines the eye's spatial resolution. Knowledge of the optical organization of a compound eye and its visual acuity is crucial for quantitative studies of the neural processing of visual information. Here we present an automated procedure for mapping a compound eye's visual axes, using an intrinsic optical phenomenon, the pseudopupil. We outline the optomechanical setup for scanning insect eyes, and use experimental results obtained from a housefly, Musca domestica, to illustrate the steps in the measurement procedure.