The purpose of this research study is to learn more about the relationship between Obstructive Sleep Apnea (OSA) and Normal Tension Glaucoma (NTG). OSA is a nighttime disorder of the upper airway that causes an intermittent lack of oxygen while sleeping. NTG is a type of glaucoma that occurs despite the normal intraocular pressure levels, making its detection more difficult. Left untreated, irreversible optic nerve damage and extensive vision loss can result. Previous research has shown some evidence between OSA and the development of NTG. The investigators are researching whether undergoing treatment for OSA would help to improve the vascular health to the retina, and in effect, improve the early signs of visual dysfunction seen with diagnostic testing.
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Prevalence of NTG
Timeframe: 2 years
Mean difference in diagnostic parameters at baseline
Timeframe: 2 years
Mean change in diagnostic parameters at follow up intervals
Timeframe: 2 years
Two PERG devices will be compared in their ability to detect retinal ganglion cell dysfunction
Timeframe: 2 years