No. the conjunctiva is the thin, moveable, and semi-transparent layer that covers the white part of the eye (the sclera). It does not extend past the edge of the cornea (the limbus). The iris sits a little behind the cornea. The conjunctiva only extends the...
Yes, usually, that is the case. Evolutionarily, our bodies are not really "built" to survive and function optimally much past age 40. But since modern medicine and technology often provide us with a lifespan almost twice that, we have to deal with our various body parts...
Presbyopia has been frustrating people for thousands of years, causing sharpness of near objects to blur. As the eyes age, presbyopia worsens and that has inspired inventors throughout the ages to get creative for the ultimate fix. Bifocal types have evolved, from the originals (celebrated by...
Great question! You have good insight and are quite right: myopic (nearsighted) people can see up close even after becoming presbyopic! This is because the default focal point for a nearsighted eye is abnormally close -the same reason their distance vision is blurred. This can come in quite...
The "index of refraction" is a term in optics referring to how much a lens material bends (refracts) light going through it. For example, air does not bend light as much as water does -something readily apparent to us when we see a pole sticking...
Guest blogger Rutland Walker talks about his Presby-Fix™ procedure 2 months after the day of surgery at Woodhams Eye Clinic. I just had my two-month check up after having the procedure done on July 15th, 2015. Presby-Fix™ is a surgical procedure to address presbyopia, (essentially the natural aging of...
Methanol is definitely something to avoid ingesting -in any quantity. Methanol (wood alcohol) is a simple alcohol very closely related to ethanol, the intoxicating chemical in whiskey, beer, and wine. But methanol is extremely poisonous and toxic specifically to the nervous system. It is so toxic...
Most people have heard that the genes for brown eyes are dominant. So how is possible for the two brown-eyed parents to have a blue-eyed child? The reason is that genes come in pairs along the twisted double DNA strands. If both of these genes code...
There really isn't a "hard line" beyond which laser vision correction should not be done -this depends on many factors that can only be evaluated in the course of a thorough ocular examination and biometric testing. This is true with any kind of laser procedure of the...
One of the most common eye problems is amblyopia, or "lazy eye", a condition in which one eye doesn't send signals to the brain as consistently or effectively as the other. Normally, light enters the eyes through the corneas and is bent, focused, and "sent" to the...