References in periodicals archive ?
The considerations here are very similar to those above (multifocal/trifocal toric); however, these lenses tend to be slightly more forgiving with respect to residual astigmatic error.
Since the outcome of astigmatic correction depends on the axis as well as the magnitude of the toric change, vector analysis was used to examine these changes.
the induced corneal astigmatic change would be minimal with the introduction of micro incision cataract surgery therefore induced astigmatism may not be a limiting for our improved UCVA.
The mean spherical refractive error in the myopic groups was -4.08[+ or -]2.17DS (range, -0.5 to -8.5DS), while that in the astigmatic groups was -3.65 [+ or -] 2.69 DS (range, -0.5 to -8.5 DS).
On the other side, in the non-foldable group, 141 patients accepted an astigmatic correction of less than 1.5 and 9 patients accepted a value of more than 1.5.
As Naeser [4] described, any net astigmatism is fully characterized by two polar values, that is the meridional (AKP) and torsional (AKP + 45) powers, where the former is the power acting along a given meridian [PHI] (i.e., preoperatively steeper meridian) and the latter is the force twisting the astigmatic direction out of that plane, thereby giving rise to a cylinder rotation.
ARCUATE KERATOTOMY: In which 6-7 mm length incisions of 80% thickness are performed on the steep axis, however arcuate keratotomy near the limbus heals quickly leaving minimal astigmatic correction effect and if it is away from limbus, it results in unstable refraction.
Atkinson and her colleagues compared performance on the Movement Assessment Battery for Children (Movement ABC) for children who were emmetropic at age 9 months and children who were hyperopic ([greater than or equal to] 3.50 D, some were also astigmatic) at age 9 months [5, 6].
Prospective evaluation of surgically induced astigmatism and astigmatic keratotomy effect of various self-sealing small incisions in cataract surgery.
That's the solution offered by Custom Ophthalmics of Fredericksburg, Virginia, which recently announced its Starpoint line of correcting lenses for astigmatic observers (S&T: July 1995, page 43).
High coherence values posit high reliability and indicate that the centroid value is a true representation of the individual SIA and preoperative or postoperative corneal astigmatic values.
I started wearing spectacles when I was about seven- or eight-years-old as I'm quite highly astigmatic. From that point onwards, I took regular trips to the optometrists.