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Cone-Enriched Cultures from the Retina of Chicken Embryos to Study Rod to Cone Cellular Interactions

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Intact high-level visual functions in congenital rod-monochromacy.

Sheer Shabat¹, Ayelet McKyton², Deena Elul²

¹Department of Physical Medicine and Rehabilitation, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.

Frontiers in Neuroscience

|October 14, 2024

Summary

Individuals with achromatopsia (ACHM), a condition causing rod-only vision, demonstrate proficient reading and face recognition skills. This suggests that a rod signal is sufficient for developing these complex visual abilities, challenging previous assumptions.

Keywords:

CNGA3 CNGB3 achromatopsia faces monochromat reading rods scotopic

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Area of Science:

Neuroscience
Ophthalmology
Visual Perception

Background:

High-level visual functions like reading and face recognition typically rely on global visual processing.
The necessity of sharp cone signals versus sufficient rod signals for developing these functions remains unclear.
CNGA3/B3-achromatopsia (ACHM) causes congenital cone dysfunction, resulting in rod-only vision with nystagmus, poor acuity, and total color blindness.

Purpose of the Study:

To investigate whether a rod-only visual signal is sufficient for the development of reading and face recognition skills.
To compare the high-level visual performance of achromatopsia patients with that of control individuals.

Main Methods:

Tested 10 ACHM patients and 10 controls on reading speed and face recognition accuracy.
Evaluated visual acuity and tracked eye movements during reading and face matching tasks.
Compared ACHM patients' performance under light conditions with controls' performance under dark conditions, matching their low-level acuity.

Main Results:

ACHM patients showed reading speeds and face recognition abilities comparable to controls.
Face inversion effects were similar between ACHM patients and controls.
Eye movement patterns in ACHM patients indicated expertise in focusing on relevant word and face areas.

Conclusions:

Rod-only vision is sufficient for the development of proficient reading and face recognition.
These findings support models of high-level vision and inform the understanding of visual deficits in individuals with late-onset sight restoration.