Presbyopia is a natural part of the human aging process. It’s the gradual loss of accommodation of the eye as one ages, which results in the inability to focus clearly on nearby objects. Common symptoms include difficulty reading small print, especially in low light conditions; eyestrain and headaches after close-up work or reading. … More Presbyopia

Tear film

Even if you’re not crying, there is a thin, moist, protective film covering your eye: the tear film. The tear film forms an optical quality interface with the air and scientific measurements suggest that human tear film is around 3 μm thick. The tear film is composed of three layers from anterior to posterior: the … More Tear film

Dry eye

Have you ever experienced that dry, itchy feeling of your eyes at the end of a long day? Dry eye syndrome is a chronic ocular disorder, and the patients either cannot produce enough tears or have poor tear quality. Dry eye syndrome is estimated to affect about 60 million Americans. The ubiquitous use of computers … More Dry eye