Astigmatism and Presbyopia Flashcards
Condition that affects everyone at a certain age?
Presbyopia
Other term for “short arm syndrome”?
Presbyopia
Condition where the amplitude of accommodation diminishes with increase in age?
Presbyopia
Condition in which virtually no accommodative ability remains?
Absolute Presbyopia
A result of the continuous gradual decline in accommodation?
Absolute Presbyopia
_____ progresses to absolute presbyopia?
Functional Presbyopia
Condition which can still be overcome by a hard or forced ciliary effort?
Facultative Presbyopia
Accommodative ability becomes insufficient for the patient’s usual near vision task at an earlier age than expected?
Pre-mature Presbyopia
Contrition in which near vision difficulties result from an apparent decrease in the AA in dim light?
Nocturnal Presbyopia
Is the maximum increase in optical power that an eye can achieve in adjusting its focus from as far as possible to the nearest possible?
Amplitude of accommodation
A small scale Snellen’s chart?
Near chart VA
The first one to produce a distance test chart for Astigmatism?
John Green
No. of cases of astigmatism reported in the period of nearly seventy years?
11
Defined as refractive condition in which a variation of power exists in different meridians of the eye?
Astigmatism
Unequal curvature of the cornea?
Corneal Astigmatism
Anterior Cornea + Residual =
Total Astigmatism
The sum resultant astigmatism of all factors of refractive system?
Total Astigmatism
In which exhibit a variation of curvature throughout different meridians?
Corneal Astigmatism
In which two principle meridians exist at right to each other?
Regural
In which either the two principle axis are not at right angles to each other?
Iregular
If with-the-rule?
Homologous
If against-the-rule?
Heterologous
When the two weakest or the two strongest meridians of both eyes do not total 180 upon addition of their meridional location.
Asymmetric
Both eyes are with-the-rule.
Homonymous
Both eyes are against-the-rule.
Homonymous
One eye is with-the-rule and the other is against-the-rule.
Heteronymous
In which the astigmatism is due to unequal curvature of the lens surface?
Lenticular
With accommodation relaxed, both principle meridian focus in front of the retina.
Compound Myopic Astigmatism
With accommodation relaxed, one meridian would focus on the retina and the other would focus in front of the retina.
Simple Myopic Astigmatism
Withe accommodation relaxed, one meridian tends to focus behind the retina, while the other focuses in front of the retina.
Mixed Astigmatism
