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Visual accommodation in the flying fox (Pteropus giganteus).

C J Murphy, H C Howland, G G Kwiecinski

Vision Research

|January 1, 1983

Summary

Flying foxes (Pteropus giganteus) can actively adjust their vision, a capability previously unknown in these megachiropteran bats. This research reveals a functional ciliary muscle enabling active accommodation.

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Area of Science:

Comparative physiology
Ophthalmology
Mammalian vision

Background:

Flying foxes (Pteropus giganteus) have a papillated retina.
Previously, megachiropteran bats were believed to lack active accommodation mechanisms.

Purpose of the Study:

To investigate the anatomy and physiology of accommodation in the flying fox.
To determine if Pteropus giganteus possesses a mechanism for active visual adjustment.

Main Methods:

Anatomical examination of the ciliary muscle in Pteropus giganteus.
Physiological testing to measure the range of accommodation.
Analysis of the retinoscopic reflex origin.

Main Results:

Pteropus giganteus possesses a well-developed ciliary muscle.

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The flying fox can actively accommodate, with a measured range of at least 3.12 D.

The retinoscopic reflex does not originate in the retinal receptor layer.

Conclusions:

The flying fox, Pteropus giganteus, is capable of active accommodation.
This finding challenges previous assumptions about visual accommodation in megachiropteran bats.
The ciliary muscle plays a key role in the visual focusing ability of this species.