33-year-old cabin crew member develops asteroid hyalosis

Selina Powell08 September 2026 Researchers have described their assessment of a 33-year-old cabin crew member with asteroid hyalosis – a condition involving primary vitreous degeneration that is typically seen in those over the age of 50. Writing in BMC Ophthalmology, researchers from the department of ophthalmology at Dujiangyan Special Crew Sanatorium in China noted that on two previous occasions the patient was mistakenly diagnosed with synchysis scintillans. Both synchysis scintillans and asteroid hyalosis appear as crystalline opacities during a slit lamp examination. However, the authors noted that asteroid hyalosis is typically seen in patients aged older than 50. The condition results in crystalline particles of calcium, phosphorous and lipids – referred to as asteroid bodies – creating scattered bright spots in the vitreous cavity. In contrast, synchysis scintillans generally occurs in younger patients and is mostly secondary to other conditions – such as trauma, vitreous haemorrhage, and chronic uveitis. The study authors highlighted that crystalline cholesterol particles in synchysis scintillans have a 'snow globe appearance' – settling with gravity after ocular motion ceases. B-scan ultrasonography in the present case revealed that the particles had limited mobility; a finding that is consistent with asteroid hyalosis rather than the gravity-dependent vitreous opacities of synchysis scintillans. The study authors reported that the patient maintained normal visual function and did not have any obvious ocular symptoms. 'As the patient is a young female aircrew member and the current ocular condition does not compromise her flight duties, she was deemed qualified for duty,' they stated. The researchers suggested that one factor in the patient developing early-onset asteroid hyalosis may be her occupation. 'The potential role of high-altitude environmental exposure in early-onset asteroid hyalosis may merit consideration. Theoretically, such exposure may induce premature vitreous degeneration via oxidative stress, altered vitreous gel fluidity, or accelerated collagen degradation triggered by hypobaric hypoxia conditions,' they stated. The researchers emphasised that this association remains purely speculative due to a lack of epidemiological investigations on the prevalence of asteroid hyalosis within the cabin crew population.