In retinitis pigmentosa, which combination of changes is typical on ERG?

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Test your knowledge on photoreceptors. Use flashcards and multiple-choice questions, each with hints and explanations. Prepare for your test with confidence!

Multiple Choice

In retinitis pigmentosa, which combination of changes is typical on ERG?

Explanation:
In retinitis pigmentosa, the degenerating photoreceptors lead to a weaker, slower electrical response when the retina is stimulated. That shows up on ERG as a smaller signal amplitude because there are fewer functioning cells contributing to the response, and a longer implicit time because the remaining cells respond more slowly. So the typical pattern is decreased amplitude with a delayed implicit time. The other possibilities would imply an unusually strong or faster-than-normal response, which doesn’t fit the degenerative nature of RP.

In retinitis pigmentosa, the degenerating photoreceptors lead to a weaker, slower electrical response when the retina is stimulated. That shows up on ERG as a smaller signal amplitude because there are fewer functioning cells contributing to the response, and a longer implicit time because the remaining cells respond more slowly. So the typical pattern is decreased amplitude with a delayed implicit time. The other possibilities would imply an unusually strong or faster-than-normal response, which doesn’t fit the degenerative nature of RP.

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