Window to the Brain: How HIV Affects the Eyes and Brain in Children
"New research reveals the link between retinal health and white matter integrity in HIV-infected children, offering insights into early brain damage."
While combination antiretroviral therapy (CART) has significantly improved the lives of children with perinatal HIV, neurological and cognitive challenges persist. These can manifest as decreased brain volume and microstructural white matter injury. Considering the close connection between the brain and neuroretinal tissue, researchers have been exploring if these deficits share common origins.
A recent study delved into this connection, assessing the relationship between neuroretinal thickness and cerebral injury in HIV-infected children undergoing CART treatment, comparing them with a control group of healthy children. The goal was to understand if changes in the retina could reflect changes in the brain.
By examining the associations between retinal measurements and brain imaging data, this research aimed to shed light on the pathogenesis of HIV-induced cerebral injury in children, and whether the eye could indeed serve as a "window to the brain".
Neurological Impact in Children
The 2024 review “Central Nervous System Complications of HIV in Children” describes HIV-associated progressive encephalopathy (HPE) as the most severe form of HIV-associated neurocognitive disorder in children. It is characterized by impaired brain growth, acquired microcephaly, upper motor neuron signs, and developmental regression. The supplied sources do not provide a specific prevalence or current global statistic for these effects.
Assessing Brain Effects
The sources describe cognitive testing and brain MRI as methods used to examine neurocognition and brain structure in children living with HIV. One cross-sectional study at a pediatric HIV referral center in St Petersburg, Russian Federation, included 37 children and used MRI and the Wechsler Intelligence Scale for Children, third edition (WISC-III), as part of routine care in 2013–15. However, cognitive performance cannot be attributed solely to inflammatory brain injury: the cited review notes overlapping influences including socioeconomic status, in-utero effects of maternal HIV, antiretroviral drug toxicity, and chronic illness. The supplied treatment guideline also advises consulting a pediatric HIV specialist when choosing a new regimen after treatment failure.
The Eye-Brain Connection: What the Study Revealed
The study involved 29 HIV-infected children on CART and 35 healthy controls. Each participant underwent a comprehensive evaluation, including magnetic resonance imaging (MRI) to assess brain volume and white matter integrity, and spectral-domain optical coherence tomography (SD-OCT) to measure the thickness of different layers in the retina.
- In HIV-infected children, decreased foveal and pericentral neuroretinal thickness was associated with damaged white matter microstructure (lower fractional anisotropy, higher mean and radial diffusivity).
- In healthy controls, neuroretinal thickness was linked to gray and white matter volume.
- This suggests that HIV-induced retinal thinning and white matter injury may share a common pathogenesis.
Retinal and White-Matter Findings
A 2022 meta-analysis and systematic review on diffusion tensor imaging (DTI) in HIV-associated neurocognitive disorder reports that HIV may jointly affect maturation of the optic nerve and white matter. A longitudinal and cross-sectional assessment of retinal structure in perinatally HIV-infected children and adolescents examined white-matter integrity, white-matter hyperintensities, and brain volumes in relation to changes in optical coherence tomography (OCT) outcomes. A separate study of middle-aged people living with HIV reported an association between cerebral small-vessel disease and thinner peripapillary retinal nerve-fiber layers and ganglion cell layers, consistent with a cited study of children.
Pediatric Neurocognitive Risks
The cited study “Cognitive Deficits in HIV Infected Children” set out to identify cognitive deficits in children with HIV by comparing them with an equal number of controls. A 2016 review explains that pediatric HIV may affect the brain through direct central nervous system injury and by impeding brain development, so its pathogenesis may partly differ from that in adults. The supplied sources discuss risk and possible mechanisms but do not provide evidence that every child with HIV develops neurological or neuropsychological problems.
Comparing HIV Exposure and Infection
A 2021 review compares neurological development in children who are HIV-exposed and uninfected (CHEU) with that of HIV-unexposed children. It considers comparisons across treatment eras and settings, as well as by antiretroviral drug regimens and drug classes. The review characterizes CHEU exposures as complex, involving HIV-specific and universal risk factors that may affect development in early life. The supplied source on pediatric cerebrospinal-fluid metabolic profiling concerns tuberculous meningitis, an HIV-associated opportunistic co-infection, rather than directly comparing developmental outcomes among these groups.
Why This Matters: Implications for the Future
This research marks a significant step in understanding the long-term neurological effects of HIV in children, even with effective viral suppression. By identifying a link between retinal health and white matter integrity, it opens new avenues for early detection and intervention.
Research and Global Tracking
The CDC Pediatric HIV Fact Sheet, updated September 3, 2026, presents the latest global statistics on childhood HIV and describes the CDC’s role and the impact of its efforts. A research review from the Pediatric AIDS Foundation summarizes pediatric and maternal HIV research presented at AIDS 2026 and describes how the organization is putting findings into practice. The supplied neurological-complications update discusses a study of virally suppressed people with HIV in Chennai, India, reporting asymptomatic neurocognitive impairment in 71% of participants on stable antiretroviral therapy; this finding concerns adults and does not establish a rate for children.
Further research is needed to fully elucidate the mechanisms driving these changes and to determine if monitoring retinal thickness can predict long-term neurological outcomes. Longitudinal studies, tracking changes in both the eye and brain over time, will be crucial.
Ultimately, this knowledge could lead to more targeted therapies and interventions to protect the developing brains of children with HIV, ensuring they reach their full cognitive potential.