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    Postop keratometry not associated with night-vision problems

    Effect was predictor of satisfaction, change in halo; but not glare, starburst, ghosting/double vision


    Subcategory analysis

    Looking at the subcategory of patients with the highest preoperative manifest SE (-8 D or less), in which the most significant flattening of corneal surface is expected, the researchers found something surprising. The postoperative Kmin was slightly steeper in those patients whose night-vision symptoms increased compared with those whose night-vision symptoms stayed the same or improved.

    More: Getting beyond the surface in ocular surface disease

    This difference as not statistically significant, but it was noteworthy because of the expected association of a flatter cornea with night-vision disturbances.

    Also in this subcategory, the patients who were satisfied with their visual acuity had a mean postoperative Kmin of 37.25, while the dissatisfied patients in this subcategory had a mean postoperative Kmin of 38.04. This difference was statistically significant (p = 0.02).

    Recent: New drape speeds ophthalmic surgery

    The researchers speculated that patients with steeper corneas might have been under-corrected, affecting their postoperative visual acuity and satisfaction. 

    The researchers also looked at other factors that might predict poor night vision.

    Related: What literature review says about modern LASIK

    “The biggest factor before surgery that predicts who will have quality-of-vision problems (glare, halos, star bursts, etc.) after surgery are people who have pre-existing quality of vision issues,” Dr. Schallhorn said.

    But even that factor couldn’t account for much of what makes patients dissatisfied.


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