Stereoacuity after wavefront-guided photorefractive keratectomy in anisometropia

Purpose: to determine changes in stereoacuity in anisometropic myopic eyes after photorefractive keratectomy (prk). methods: myopic patients with at least 1 diopter (d) of anisometropia in sphere,astigmatism,or spherical equivalent who were referred to our hospital for excimer refractive surgery were enrolled as a prospective sequential interventional case series. all patients underwent wavefront-guided photorefractive keratectomy (wfg-prk) using the technolas perfect vision (217z) excimer laser machine. changes in binocular stereoacuity were evaluated using the tno and butterfly stereoacuity tests before and at 2 weeks,1 month,and 3 months after the operation. results: between january and november 2015,a total of 98 eyes of 49 patients (71.4% men) with a mean age of 28 ± 5.5 years,mean myopia of -3.32 ± 1.74 d,and mean astigmatism of 1.3 ± 1.3 d were enrolled in this study. preoperative mean stereoacuity values were 102 ± 103.44 and 56.8 ± 41 seconds of arc (s/arc)as measured by the tno and butterfly stereoacuity tests. mean stereoacuity improved to 90 ± 110.52 s/arc (p = 0.009) and 56.5 ± 41.3 s/arc (p = 0.80),respectively,6 months after wfg-prk. overall improvement in stereoacuity was 10.2% and 6.12% according to the tno and butterfly stereoacuity tests,respectively. conclusion: stereoacuity improves after wfg-prk for treatment of anisometropic myopia. this improvement is more accurately detectable by the tno than the butterfly stereoacuity test. karimian farid 1 ocular tissue engineering research center; ophthalmic research center,shahid beheshti university of medical sciences,tehran ownagh vahid 2 ophthalmic research center,shahid beheshti university of medical sciences,tehran amiri mohammad 3 department of optometry,school of rehabilitation,shahid beheshti university of medical sciences,tehran tabatabaee seyed 4 department of biostatistics,shahid beheshti university of medical sciences,tehran dadbin nooshin 5 negah eye center,tehran kaufman fl,alm a,adler fh. stereopsis in: adler's physiology of eye: clinical application,10th ed. st louis: mosby,2003;. p. 354-362. noorden gk von. binocular vision and ocular motility: theory and management of strabismus,5th ed. st louis: mosby; 1996. p. 175-178. merriam ww,ellis fd,helveston em. congenital blepharoptosis,anisomertopia,and amblyopia. am j ophthalmol 1980;89:401-407. beneish r,williams f,polomeno rc,little jm,ramsey b. unilateral congenital ptosis and amblyopia. can j ophthalmol 1983;18:127-130. duke-elder s. system of ophthalmology. london: mosby; 1972. p. 457-462. de donato lm,rouse mw. refractive anisometropia. am opt assoc 1982;53:489-490. sanfilippo s,muchnick rs,schlossman a. preliminary observations on high anisometropia. am orthoptic j 1978;28:127-129. kushner bj. concern about the pediatric eye disease investigator group 2-year follow-up study. arch ophthalmol 2005;123:1615-1616. duling k,wick b. binocular vision complications after radial keratotomy. am j optom physiol opt 1988;65:215-223. scheiman mm,rouse mw. optometric management of learning-related vision problems. mosby; 1994. p. 556-563. rouse m. optometric assessment of visual efficiency problems. in scheiman mm,rouse mw. optometric management of learning-related vision problems. mosby; 1994. p. 632-637. donders fc. on the anomalies of accommodation and refraction of the eye. hatton garden; 1864. p. 342-348. wick b,wingrad m,cotter s,scheiman m. anisometropic amblyopia: is the patient ever too old to treat? optom vis sci 1992;69:866-878. isenberg s,urist mj. clinical observations in 101 consecutive patients with duane's retraction syndrome. am j ophthalmol 1977;84:419-425. brooks s,johnson d,fischer n. anisometropia and binocularity. ophthalmology 1996;103:1139-1143. benjamin wj,borish im. borish's clinical refraction. professional press; 2006. p. 1479-1508. schipper i. anisophoria after implantation of an intraocular lens. j am intraocul implant soc 1985;11:290-291. rosenbloom a,morgan m. principles and practice of pediatric optometry. philadelphia: jb lippincott; 1990. p. 243-251. nelson l,calhoun j,harley r. pediatric ophthalmology,3rd ed. wb saunders; 1991. p. 222-234. karimian f,feizi s,jafarinasab mr. conventional versus custom ablation in photorefractive keratectomy: randomized clinical trial. © 2017 journal of ophthalmic and vision research published by wolters kluwer - medknow.