Medically reviewed by Johnstone M. Kim, MD Key Takeaways The pupil controls how much light enters the eye, allowing for clear ...

Please provide your email address to receive an email when new articles are posted on . Visual field defects, afferent pupillary defects and abnormal optic discs were associated with positive ...

The PERRLA test is a standard eye examination that can help healthcare professionals diagnose a wide range of health issues, including vision problems and some neurological conditions. People may ...

Please provide your email address to receive an email when new articles are posted on . With cataract surgery we make an assumption that the center of the visual axis, the center of the pupil and the ...

NEW YORK (Reuters Health) - Tests of pupil function, as an indicator of how well the automatic nervous system is working, may help predict how likely young diabetics are to develop "microvascular ...

Neurological conditions can be devastating. Conditions like Alzheimer’s (which is becoming increasingly common as the general population starts to get older) can significantly affect cognition, memory ...

For the first time, researchers have been able to observe how the pupils react during sleep over a period of several hours. A look under the eyelids showed them that more happens in the brain during ...

The iris is a structure behind the transparent cornea of the eye. It has a circular opening called the pupil that changes size in response to the light level. Your pupils are usually the same size as ...

Abnormalities in horizontal eye movements detected with video oculography (VOG) may support the early diagnosis of atypical forms of Alzheimer’s disease (AD), according to a French study that adds to ...

Arousal is a fundamental part of how our brain keeps us alert, engaged, and responsive to the world around us. It is controlled by networks deep in the brainstem, like the locus coeruleus (LC), which ...