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Aniseikonia

Concerns with Lasik, All-Laser Lasik, PRK, LASEK, Epi-Lasik, CK, P-IOL, RLE, etc.


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Differing image sizes can cause headaches, blurry vision, and poor depth perception.

 

Aniseikonia is a binocular condition in which left and right images differ significantly in size or shape. Aniseikonia can be resolve with with conventional or custom wavefront Lasik, All-Laser Lasik, PRK, LASEK, Epi-Lasik excimer laser assisted or lens based refractive surgery procedures like RLE and P-IOL.refractive surgery if the imbalance is caused by simple myopia (nearsighted, shortsighted), hyperopia (farsighted, longsighted), or astigmatism that can be corrected.

There are two types of aniseikonia – static and dynamic aniseikonia. The first type is the classical aniseikonia, denoting a perceived image size difference with a fixed gaze direction. Classic aniseikonia can occur naturally or be induced by refractive surgery. Aniseikonia is most pronounced when one eye is hyperopic and one eye is myopic.

Typical symptoms of aniseikonia are headaches, blurry vision, sore burning tearing eyes, photophobia, reading difficulty, distorted depth perception, nausea, binocular diplopia, and even nervousness, vertigo and dizziness.

Aniseikonia can be induced by refractive surgery, typically when refractive error is different in one eye than the other after surgery. Aniseikonia may occur if a myopic patient is overcorrected in one eye into hyperopia, a hyperopic patient is overcorrected in one eye into myopia, or any combination where the refractive error is significantly different after refractive surgery. Aniseikonia may occur if one eye is significantly more astigmatic than the other, or irregular astigmatism causes an imbalance in the two images.

Temporary aniseikonia almost always occurs during the gap between refractive surgeries when a patient has surgery performed on one eye at a time.

If aniseikonia occurs or when refractive surgery is planned one eye at a time, the least invasive response is for the patient to wear a contact lens or lenses to fully correct both eyes to plano. If aniseikonia occurs as an unplanned complication of refractive surgery, refractive surgery induced aniseikonia may be able to be be resolved with enhancement surgery to balance the refractive error in both eyes.

If you are ready to choose a doctor to be evaluated for conventional or custom wavefront Lasik, All-Laser Lasik, PRK, LASEK, Epi-Lasik, NearVision CK, RLE, or any refractive surgery procedure, we highly recommend you consider a doctor who has been evaluated and certified by the USAEyes nonprofit organization. Locate a USAEyes Evaluated & Certified Lasik Laser Eye Surgeon.


Current Aniseikonia Medical Journal News...

Improvement of visual acuity following refractive surgery for myopia and myopic anisometropia.

Related Articles

Improvement of visual acuity following refractive surgery for myopia and myopic anisometropia.

J Refract Surg. 2007 May;23(5):447-55

Authors: Vuori E, Tervo TM, Holopainen MV, Holopainen JM

PURPOSE: To test the hypothesis that anisometropic adults without significant amblyopia suffer from mild visual impairment probably due to aniseikonia, which might be improved by corneal refractive surgery. METHODS: Fifty-seven patients presenting with myopic anisometropia > or = 3.25 diopters (D) and 174 myopic controls appropriate for refractive surgery were included. Photorefractive keratectomy (PRK) or LASIK was performed on 57 anisometropic eyes. As 43 of the 174 myopic control patients had bilateral surgery, PRK or LASIK was performed on 217 myopic control eyes. Best spectacle-corrected visual acuity (BSCVA), refraction, and refractive correction were measured preoperatively and at 1, 3, 5 to 7, 8 to 13, and 25 months following surgery. RESULTS: Preoperative mean spherical equivalent was -7.20 +/- 2.40 D for anisometropic patients and -6.40 +/- 1.90 D for myopic patients. At 8 to 13 months postoperatively, when 23 (40%) anisometropic eyes and 94 (43%) myopic eyes were examined, the mean spherical equivalent refractions were -0.80 +/- 1.60 D and -0.30 +/- 0.60 D, respectively. Preoperatively, the mean BSCVA on a logMAR scale was -0.0143 +/- 0.0572 (Snellen 0.98 +/- 0.12) in the anisometropic group and 0.0136 +/- 0.0361 (Snellen 1.04 +/- 0.09) in the control group (P = .001). Eight to 13 months postoperatively, these values were 0.0076 +/- 0.0659 (Snellen 1.03 +/- 0.15) and 0.0495 +/- 0.0692 (Snellen 1.13 +/- 0.18) and this difference remained statistically significant (P = .012). For the myopic patients, the improvement in BSCVA reached almost maximum at 3 months, and this improvement was found to be highly significant 3 months after surgery (P = .001). The improvement in BSCVA was significantly slower for anisometropic patients and became statistically significant only after 8 to 13 months postoperatively (P = .041). CONCLUSIONS: Anisometropia reduces visual acuity in the more myopic eye and can be at least partially reversed by refractive correction. The slower improvement in BSCVA for anisometropic patients suggests plastic changes in the visual cortex following refractive surgery.

PMID: 17523504 [PubMed - indexed for MEDLINE]


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Last updated Friday, April 25, 2008

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