Judith Flanagan, PhD
Reduced prevalence of dry eye in children, fewer subjective symptoms, and limitations of current diagnostic procedures may result in clinicians overlooking dry eye.
Dry eye disease is a chronic condition affecting up to 50% of the population, characterized by ocular discomfort and visual disturbances that can cause a significant decrease in quality of life.1 Contact lenses contribute to dry eye, with more than 50% of lens wearers reporting dry eye symptoms.2
Myopia is an epidemic among young people in East and Southeast Asia, with around 80% to 90% affected3 and up to 20% suffering high myopia.4 For myopia correction and control, soft contact lenses and orthokeratology are increasingly considered in children and teens. Although there have been reports of contact lens-related discomfort reported by children,5-7 the evidence on pediatric dry eye is not entirely clear, with some suggestions that pediatric patients, including pediatric lens wearers, may have fewer complaints than adults.8,9
OrthoK and Dry EyeIn a study comparing the vision-related quality of life with orthokeratology and single vision spectacles, 30% to 40% of children reported discomfort/itchy/burning/dry eyes after lens insertion.10 Interestingly, whether OrthoK contributes to or alleviates dry eye is not clear. The American Academy of Orthokeratology and Myopia Control (AAOMC) and the Orthokeratology Society of Oceania support OrthoK as appropriate for children unable to wear other lenses due to dry eye or allergies,11 while other evidence indicates dry eye as underdiagnosed in OrthoK wear.
For example, OrthoK wear was found to reduce the stability of tear film (increased evaporation and thinning) and was thought to induce ocular inflammation due to meibomian gland disruption.12-14 Tear film instability (and attendant sequelae) with OrthoK lens wear in children was ascribed to OrthoK-induced irregular corneal surface changes.15 Reports of no change in tear meniscus height or OSDI from pre-OrthoK levels after months of wear16 contrast with data suggesting initial increases in dry eye subsiding within the month of lens wear2 and possibly suggesting rapid neuronal adaptation in children.4
Although the relation between pediatric contact lens wear and dry eye is not entirely clear, there are certain important parameters that practitioners need to be aware of to deliver reduced rates of myopia progression, while offering improved quality of life with reasonable comfort. Compliance with lens wear is vital for efficacy, and studies have shown a complex relationship between overall comfort to adherence to lens wear and, therefore, efficacy.17
Tear Film Stability is Important for Pediatric Myopia Control15Reports of increased partial blinking after OrthoK enrollment18 mandate increased observation of such. In relation to pediatric OrthoK patients’ tear film, lipid layer thickness in children requires different standards to adults. Hence, the usual Lipiview test might not be reliable in children.18 Also, it is essential to remember that allergic conjunctivitis has a higher prevalence in children and can induce dry eye, making dry eye diagnosis more difficult.19 Keratograph assessment detecting tear meniscus height and meibomian gland dropout perform well in children, especially in combination with questionnaires to facilitate dry eye diagnoses.19 For high myopes, targeted reduction of refractive error (RE) can require more pressure from lenses on the cornea, leading to increased staining, corneal and tear film irregularities, discomfort, and dry eye. To reduce this risk, partial reduction of RE might be considered,20 along with education and more frequent follow-ups.20
Finally, perceived poorer vision and comfort are related to reduced compliance, indicating the importance of communication, which can be difficult for children. Targeting males and those with lower myopia who show reduced adherence to myopia control lenses can also help adherence to lens wear.17
In summary, reduced prevalence of dry eye in children, fewer subjective symptoms, and limitations of current diagnostic procedures may result in clinicians overlooking dry eye.19 While contact lens platforms offer powerful myopia control for children, in prescribing, we should be mindful of the ocular surface of the patients, especially meibomian gland function and dry eye prevalence, which can reduce comfort and adherence, which ultimately leads to worse outcomes.19
SUMMARY:To maximize the comfort of pediatric contact lens wearers, eye care practitioners should:
1. Be mindful that tear film stability impacts ocular discomfort, and therefore pay attention to meibomian glands, blinking rate, corneal staining, and subjective symptoms.
2. Be aware of the greater incidence of allergic conjunctivitis in children that might be confused with dry eye disease.
3. Be mindful of potential compliance issues related to poor vision, discomfort, male sex, and lower power of correction, all of which are reported markers of reduced compliance.
Geetha Sravani, PhD Candidate
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