All animals have evolved visual systems that maximize their likelihood to pass on their genes to succeeding generations. For animals that are often prey (e.g. frogs and many fish), having the very widest field of vision is highly important to minimize the risk of getting...
Overcorrection in hyperopic patients is not well tolerated generally. These eyes are accustomed to maintaining an elevated degree of ciliary muscle tension just to neutralize the hyperopic blur at distance. They are furthermore conditioned to accommodate (increase the ciliary muscle tension) in response to blur...
Yes…but it is a very old and outdated way to measure hearing! The EENT (Eye, ear, nose, and throat) medical specialty began to evolve over 100 years ago. At that time, both hearing and vision were recorded using the same 20/x notation system. The eye chart...
Visual acuity testing can be done without using letters, for example in children or other individuals who might be literacy challenged. Another example would be working with foreign adults who are only familiar with their own alphabets (e.g. Japanese). There is the "tumbling E" chart which...
Many people are exposed to myths about their eye health as children, and they carry unfounded notions about what is good or bad for their eyes into their adult years. The following list will help debunk some myths about what will damage your vision. Watching Television...
LASIK (and PRK) were originally FDA approved for treating even such high levels of myopia (nearsightedness). But more recent experience and data have shown that the threshold for long-term stability and safety in laser vision correction is probably about -6 to -7 Diopters, maybe even lower. While LASIK can be...
The human eye rarely continues to grow in length or size past our second decade of life. So nearsightedness, associated with excessive growth of the eye, has usually leveled off by then. The cornea ( which does most of the focusing of the eye) really doesn't...
You can consider having vision surgery if you are dependent on glasses or contact lenses no matter how low or high your prescription. In general, laser vision correction works best for nearsighted (myopic) people under about -8 diopters. There are better options for people with...
Keratoconus (and the spectrum of keratoconus-like problems of the cornea) are easily missed within the context of a normal, routine eye exam. Without specialized diagnostic equipment, keratoconus is usually only discoverable in its advanced stages using biomicroscopy (slit lamp) and refraction. While this may be...
It depends on how bad the hyperopia is and your particular vision needs. We see many Delta pilots at the clinic -almost all of them are hyperopic! But they rarely know it and almost never have even heard of hyperopia. Hyperopes have usually never worn glasses...