Some eye drops carry a freshness index from zero to five. When the index sits at four or five, users often notice a pronounced burning sensation upon application. It is a fact that in several Asian countries menthol is included as part of treatments aimed at both preventing and addressing dry eye syndrome. This practice has been discussed by ophthalmology professionals, including researchers affiliated with institutes focused on brain science and ocular health. Notable figures in the field have commented on menthol’s effects in clinical settings.
Ophthalmologists explain that menthol creates a local vasoconstrictor response and can irritate the surface of the eye. This irritation stimulates a temporary tear reflex, providing a momentary sensation of relief as tears wash across the conjunctiva and cornea. For some patients, this initial relief comes quickly, giving the impression of freshness as the eye surface is moistened briefly.
However, dry eye syndrome is defined by imperfect tear production and regulation. When tear osmolarity rises, the tear film contains higher levels of salts and acids, which disrupt the tear’s neutral pH. In dry eye, the natural tears may become irritating themselves and, in some cases, may promote tears with an altered pH that does not properly stabilize the ocular surface.
This creates a vicious cycle. To interrupt it, clinicians commonly prescribe artificial tears or lubricating eye drops. These products mimic the function of natural tears by matching osmolarity and providing moisture to the eye. By restoring a more stable tear film, there is less need for the eye to trigger reflex tearing, helping to reduce discomfort and irritation over time.
For guidance on which substances are unlikely to be beneficial for dry eye syndrome, which active ingredients are appropriate for prevention of age-related eye conditions, and which eye drops may be potentially harmful, readers are encouraged to consult the latest clinical reports and reviews from reputable ophthalmology sources. The topic is routinely reviewed by ophthalmic researchers and clinicians who synthesize evidence to guide safer, more effective care for patients with dry eye symptoms. These sources emphasize careful selection of lubricants based on tear film physiology and patient-specific needs, rather than relying on quick fixes or irritants. The aim is a stable tear film, lower osmolarity, and lasting comfort for daily life. In clinical practice, treatment plans are individualized, combining lifestyle adjustments, appropriate artificial tears, and, when needed, prescription therapies under medical supervision. The overall goal is to protect the ocular surface, support natural tear production where possible, and minimize irritation that can perpetuate the problem. Finding the right drops involves considering symptoms, tear quality, and the health of the ocular surface, with ongoing monitoring to adjust care as needed. This patient-centered approach reflects current consensus in ophthalmology and is supported by ongoing research and clinical guidelines. [Attribution: Ophthalmology research reviews and clinical guidelines]