The essential factor in accommodation is a contraction of ciliary muscle, convergence and the contraction of pupil. This associated action is called synkinesis. The convergence and accommodation are closely related…
In emmetropic eye parallel rays of light coming from infinity refract & focus on the retina, when accommodation at rest. Accommodation: It is the unique ability of eye to focus…
The mechanism whereby the converging power of the eye is increased so that a distinct image is still retained is called ACCOMMODATION. (Ref: Duke-Elder & David Abrams) ACCOMMODATION refers to…
Aniseikonia is a condition where the ocular image of an object seen unequal in size and shape. That means actually, "not equal image" from two eyes. In most of patient…
In older optometric/ophthalmic textbooks, rules of thumb have been defined to correct aniseikonia, without actually testing for the amount of aniseikonia. These rules are based on Knapp’s law, which deals…
The term aniseikonia is used to define the ophthalmic disorder of human where an object producing a different size of image in the two eyes retina. Most of the time…
Aniseikonia is an ocular condition, where the image projected to the visual cortex from two retinaie are abnormally unequal in size and shape, mainly aniseikonia is a defect of binocular…
INTRODUCTION OF ANISEIKONIA: Aniseikonia usually means unequal image. The word " Aniseikonia " comes from the Greek morphology. "A" means Not + "iso" means equal + "konia" means image. Aniseikonia…
Asthenopia, commonly known as eyestrain (as-the-no-pia: fatigue of eyes) is caused mainly due to prolonged near work, leading to fatigue of eyes. Management of asthenopia: Adjust the lighting: Keep your…
Asthenopia is defined as pain, discomfort, or fatigue in or around the eyes, combination aetiology of asthenopia is probable, in which accommodation and convergence are both at play in the…