he Intermittent Exotropia Questionnaire (IXTQ) is a patientderived, intermittent exotropia-specific instrument designed to evaluate health-related quality of life (HRQOL) in children with intermittent exotropia and their parents. 1,2 The IXTQ consists of 3 parts: the 12-item child IXTQ (completed by the child to assess the child's HRQOL), the 12-item proxy IXTQ (completed by the parent to assess the child's HRQOL), and the 17-item parent IXTQ (completed by the parent regarding his or her own HRQOL). 1 The child and proxy questionnaires each have a single subscale. The parent questionnaire contains 3 subscales: psychosocial, function, and surgery. The IXTQ is reliable and valid for assessing HRQOL in children with intermittent exotropia. [1][2][3] It is available for download free of charge at http://pedig.jaeb.org/.The IXTQ was originally developed using classical test theory. Rasch analysis may be used to modify and improve existing HRQOL instruments. [4][5][6][7][8][9] In the present study, Rasch analysis was used to refine the existing IXTQ, removing items that do not contribute meaningful information to the instrument and ensuring that response options are properly interpreted. Methods Patient CohortParents gave written informed consent, and children gave written assent when required. The protocol was approved by the institutional review boards of the Mayo Clinic, Jaeb Center for Health Research, and other local sites involved in the study. Data were collected and analyzed in accordance with the Health Insurance Portability and Accountability Act guidelines. The IXTQ was completed by 575 parents of 575 children aged 1 through 16 years with intermittent exotropia at the time of their child's clinic examination, enrolled from May 15, 2008, through July 24, 2013. The 295 children aged 5 years or older completed the age-appropriate child IXTQ. Parents and children completed the IXTQ as part of routine care in the strabismus practice of one of the authors (J.M.H., n = 110) or at the enrollment examination for 1 of 2 ongoing randomized clinical trials being conducted by the Pediatric Eye Disease Investigator Group (NCT 01032603 [n = 69] and NCT 01032330 [n = 396]). Child questionnaires were administered to children aged 5 through 7 years by study personnel. All 8-to 17-year-old child, proxy, and parent questionnaires were self-administered. Patient demographics are reported in eTable 1 in the Supplement. Statistical AnalysisBefore Rasch analysis, items with floor and ceiling effects on the child, proxy, and parent IXTQs were eliminated as described in the eMethods in the Supplement. Rasch analysis was performed on each of the 4 IXTQs using the analytic methods that we have applied previously (eMethods in the Supplement). 9 The performance and structure of the Rasch-IMPORTANCE The Intermittent Exotropia Questionnaire (IXTQ) is a patient, proxy, and parental report of quality of life specific to children with intermittent exotropia. We refine the IXTQ using Rasch analysis to improve reliability and validity.OBSERVATI...

Most children were able to complete aniseikonia testing with AI3. Background aniseikonia was clinically insignificant (0.59%), and induced aniseikonia measurements were close to expected values using a 4% size lens. Aniseikonia Inspector Version 3 appears to be a useful means for measuring aniseikonia in a normal pediatric population. Further study in children with anisometropia is needed.

This study confirms previous reports of similar visual outcomes between PTO and FTO. However, compliance rates for FTO seem to be higher and some children who have failed PTO may improve with FTO.

Diplopia is a potential undesirable outcome of nearly any ocular surgery. In some cases, the unexpected strabismus and diplopia resolve quickly without intervention, especially if due to swelling or minor insult from the surgical procedure. When double vision persists, effective treatment may be more elusive in patients in which the strabismus is the result of a restrictive process. The sudden onset of strabismus makes treatment more challenging. Frequently these patients will require surgical intervention. Where possible, patients may be managed with nonsurgical treatments until the time of surgery or indefinitely if successful and acceptable to the patient. Diplopia has been documented as a result of restrictive strabismus following vitreoretinal surgery, glaucoma surgery, orbital decompression surgery, strabismus surgery, orbital surgery, conjunctival surgery, cataract surgery, blepharoplasty, and others. The treatment of diplopia after ocular surgery is complicated by the incomitance and torsion that may be associated with restrictive strabismus as well as the variability of the deviation during healing. Nonsurgical treatment options include prisms or occlusion. Fresnel prisms are used primarily, but occasionally the prism is ground into the spectacles. Occlusion of the involved eye may be partial or complete, using a "pirate" patch, adhesive patch, Bangerter foil, tape, or related method.