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Remember when ODs diagnosed dry eye using a slit lamp and treated with artificial tears? I think it was back when we refracted with loose lenses and panicked if a soft contact lens dropped on the floor.
We used paper charts, wrote on real paper, and mailed letters in envelopes with stamps we had to lick to get them to stick. Life was so simple then.
ODs today have computerized phoropters, daily disposable contact lenses, and electronic medical records (EMR). We rarely talk to a pharmacist because we send prescriptions over the Internet. Dry eye diagnosis and treatment have become increasingly complex in this not-so-simple age.
Our understanding of ocular surface disease has expanded to include highly sophisticated testing. Patients are no longer told to “use artificial tears and see me in a year.” Evaporative dry eye has refocused dry eye treatment to the lids.
Here is a list of the modern testing techniques ODs use for dry eye diagnosis.
Vital dye staining of cornea/lids/conjunctivae
Sodium fluorescein dye for epithelial integrity is the mainstay for corneal staining. It permeates the intercellular space associated with epithelial cellular disruption and is also beneficial for break-up time assessment and epithelial basement membrane dystrophy (EBMD) evaluation.
Lissamine green is preferred for staining the conjunctivae. Lissamine green stains dead and dying cells on the cornea and bulbar conjunctiva. Its affinity for conjunctivae facilitates diagnosis of lid wiper epitheliopathy (LWE). It is also tolerated better than rose bengal.
Lid expression can be performed diagnostically using a finger, swab, or tool. Gentle pressure applied to the lid margin to assess the meibomian gland function is newly recommended to assess lid health.
You may be surprised how many glands look relatively normal until you apply pressure to find out nothing is expressed. Paddles are used to therapeutically treat meibomian gland dysfunction (MGD) by evacuating the glands more vigorously.
Using meibography with infrared imaging allows assessment of gland architecture and identification of gland loss. Other techniques less commonly used for meibography include ocular coherence tomography (OCT) and laser confocal microscopy.
Infrared systems may be added to the slit lamp or be stand-alone systems. An OD may be able to bill for anterior segment photography (CPT code 92285) for this procedure.
Blink rate assessment, quality of blink
Patients with ocular surface disease have trouble holding their eyes open without blinking, and may blink incompletely.1
1. White R, Rodriguez J, Lane KJ, Johnston P, Angjeli E, Abelson MB. Blink patterns in normal and dry eye subjects; beyond blink rate. Invest Opthalmol Vis Sci. 2010 Apr;(51):3366.
2. Hwang HS, Kim EC, Kim MS. Novel tear interferometer made of paper for lipid layer evaluation. Cornea. 2014 Aug;33(8):826-31.
3. Messmer EM, von Lindenfels V, Garbe A, Kampik A. Matrix metalloproteinase 9 testing in dry eye disease using a commercially available point-of-care immunoassay. Ophthalmology. 2016 Nov;123(11):2300-2308.