What astigmatism is characterized by a 43.00 @180/44.00 @090?

The astigmatism characterized by the refractive values of 43.00 @180 and 44.00 @090 is described as simple myopic astigmatism. This type of astigmatism occurs when one principal meridian is myopic (having a lower power) and the other principal meridian is either emmetropic (having no refractive error) or also myopic but to a lesser degree.

In the case presented, the power of 43.00 diopters at 180 degrees represents one meridian, while 44.00 diopters at 90 degrees represents another meridian. The lower power (43.00) indicates that the eye is more myopic along that meridian compared to the other. Since the other parameter is not significantly hyperopic, this confirms that the overall nature of the astigmatism is simple myopic, where one meridian is normal or slightly more myopic than the other.

The values do not represent irregular astigmatism because there are two defined principal meridians and the change in power is uniform. It also does not indicate simple hyperopic astigmatism, where one meridian would need to be hyperopic. Similarly, it doesn't qualify