Anisometropia Flashcards
“iso” in Greek is?
equal
is defined as a condition in which the refractive status of one eye differs from that the other.
Anisometropia
A form of anisometropia in which one eye is myopic and the other hyperopic.
Antimetropia
The condition in which the refractive status is equal in the two eyes.
Isometropia
• The condition in which the two eyes have unequal refractive power. One eye may be myopic (nearsighted) and the other hyperopic (farsighted) or one eye may be markedly stronger than the other.
ANISOMETROPIA or ASYMMETROPIA
different amount of the same error of refraction.
ANISOMETROPIA
different type of errors such as hyperopia vs. myopia or spherical vs. astigmatic.
Antimetropia
this occurs because of differential growth of the eyeball of both eyes. It is hereditary in origin.
Congenital Anisometropia
created by trauma, pathology or the results of systemic changes.
Acquired Anisometropia
It is a condition in which the refractive power of the two eyes is unequal.
Absolute anisometropia
It is that type of refractive anomaly in which although the total refraction of the two eyes is equal, the component elements in each show relatively large differences.
Relative anisometropia
Types of Absolute Anisometropia
- Simple
- Compound
- Mixed
- Simple Astigmatic Anisometropia
- Compound Astigmatic Anisometropia
- Mixed Astigmatic Anisometropia
In this, one eye is normal and the other is either hypermetropic or myopic.
Simple AA
In this, both eyes are ametropic either hyperopic or myopic, but one eye has a higher refractive error.
compound AA
In this both eyes are ametropic. One eye is hyperopic and the other is myopic. This is called antimetropia.
mixed AA
when one eye is normal and the other has either myopic or hyperopic astigmatism.
Simple Astigmatic Anisometropia
when both eyes are astigmatic but of unequal degree.
Compound Astigmatic Anisometropia
If there is a difference of more than 5D between the two eyes, the patient loses binocularity.
Binocular Vision
If the anisometropia is high and the eyes have a good visual acuity, the patient gets into the habit of using the hypermetropic eye for distance and the myopic eye for near vision.
Alternating Vision
If the defect in one eye is high and if its visual acuity is not good, the eye can be excluded altogether from vision and the
Amblyopia
A concomitant convergent squint occurs in children with the eye having the defect becoming convergent.
Strabismus
is a serious concern in newborns and young children because it can lead to amblyopia (impaired vision in one eye).
Anisometropia
this is commonly referred to as lazy eye.
Amblyopia
this is when a person is not able to align both of their eyes under normal conditions simultaneously and is referred as being cross eyed.
Strabismus
this is when a person has double vision
Diplopia
also known as the Worth’s Four Dot test or W4LT, is a clinical test mainly used for assessing a patient’s degree of “binocular vision” and “binocular single vision”.
Worth Four Light Test
A red reflex is when light is transmitted through the transparent portions of the eye and reflects off the retina, creating a reddish orange reflection in the eyes.
iScreen Vision
The various modes of treatment and management are:
Spectacles Contact lenses Refractive laser --- LASIK laser Phakic IOL Clear lens extraction with the implantation of an IOL
