LLLT, or phototherapy, refers to the use of photons at a non-thermal irradiance to alter biological activity. The treatment you would receive at Southwest Vision uses non-coherent light sources consisting of filtered lamps or light-emitting diodes (LED).
The indication to use LLLT is to reduce inflammation, promoting tissue repair and regeneration, as well as preventing tissue damage in situations where it is likely to occur. This process is referred to as “low level” because the energy employed are low compared to other forms of treatments like laser, ablation, cutting, and thermal coagulating tissue.
Red light penetrates the skin and is absorbed by the cells and stimulates energy production. This will then stimulate the light absorbing chromophore (cytochrome c oxidase) which causes nitric oxide (NO) to release. When NO is released this increases blood flow to the surrounding tissue which produced cell proliferation. This increased in blood flow has anti-inflammatory and healing properties.
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LLLT related to Dry Eye Therapy
The ability to apply LLLT to the upper lid, where generally it is considered unsafe to apply IPL, may further contribute to meibomian related dry eye therapy success. LLLT is local transient “heating” of the absorbing chromophore based on electric or light oscillations. Through photoactivation, tear volume decreased and corneal irregularities gradually improved. The effects on the lacrimal gland (the gland responsible to tear production) showed a reduction in inflammatory cells.
LLLT related to stye and chalazion treatments
LLLT can also treat recalcitrant chalazions and active styes, where 39% of eyes showing resolution after a single 15-minute treatment with topical and/or oral pharmaceutical therapy. 91% of eyes showed resolution after 1-2 treatments all within 2 months.
LLLT as an add-on therapy
LLLT can be combined with IPL treatments and Optipen treatments for styes/chalazions to further treat meibomian gland dysfunction that causes dry eyes. The thermal-based effects of the IPL treatment are presumably augmented by additional photo-biomodulation effects of the LLLT treatment to the lids and periorbital area.