Background: The purpose of this study is to elucidate the prevalence of strabismus and amblyopia in a large population of Japanese elementary school children, from Grade 1 to Grade 6, ages ranging from 6 to 12 years. The School Health Law requires that all pupils in Grade 1 to Grade 6 be examined for vision and eye problems. Visual acuity testing is done by school teachers and eye disease screening by school ophthalmologists. Pupils with suspected ocular diseases are further examined by extramural ophthalmologists and the results reported back to the schools. The schools then summarize and send uncorrected visual acuity and ocular disease incidence, together with other health statistics, to the municipal education committees. The data are forwarded to the Prefecture Governments and finally submitted to the Education Ministry of the Central Government. Both the Prefecture Governments and the Education Ministry publicize the school health statistics on their websites. The prevalence of strabismus and amblyopia remains unknown from these data because both diagnoses are included under the heading, eye diseases. Methods: Questionnaires asking about the numbers of children with different types of strabismus and amblyopia were sent to all elementary schools in Okayama Prefecture and the results were summarized. Results: The number of children covered by the return of questionnaires was 86,531 (76.4%) of 113,254 total pupils in Grade 1 to Grade 6 in Okayama Prefecture in the year 2003. The total numbers of children with strabismus and amblyopia were 1,112 (1.28%) and 125 (0.14%), respectively. The numbers of children with any type of exotropia and any type of esotropia were 602 (0.69%) and 245 (0.28%), respectively. The major types of strabismus and amblyopia were intermittent exotropia in 109 children (0.12%), accommodative esotropia in 19 children (0.02%), anisometropic amblyopia in 23 children (0.03%), and ametropic amblyopia in 12 children (0.01%). The number of children with strabismus of unknown type was 245 (0.28%) while the number of children with amblyopia of unknown type was 81 (0.09%). Conclusions: The prevalence rates of strabismus and amblyopia in this population of Japanese elementary school children were lower than those reported in Western countries. The exotropia/esotropia ratio were increased in comparison with past studies in Japan. The school eye doctors need to be more diligent in identifying and diagnosing various types of strabismus and amblyopia in order to contribute to the school vision screening program already in place in Japan

Key Clinical Message: A patient with metastatic cutaneous malignant melanoma developed Vogt‐Koyanagi‐Harada disease‐like posterior uveitis after two nivolumab (anti‐PD‐1 antibody) injections. Vogt‐Koyanagi‐Harada disease, with the background of autoimmunity against choroidal melanocytes, suggests nivolumab be working by disintegrating inhibition circuit of T cells against a common epitope shared between melanoma cells and normal melanocytes.

The purpose of this study is to determine the relationship of ocular adnexal benign or reactive lymphoid hyperplasia, including orbital pseudotumor, with immunoglobulin G4 (IgG4)-related diseases. Medical charts of 9 consecutive patients with ocular adnexal benign lymphoid lesions, seen in the Department of Ophthalmology, Okayama University Hospital, were reviewed, and pathological sections were restained immunohistochemically for IgG4-, IgG-, and CD138-positive plasma cells. The diagnosis of IgG4-positive lesions was based on 10 or more IgG4-positive plasma cells in a high-power field and greater than 40% ratios of IgG4-positive plasma cells/CD138-positive plasma cells and IgG4-positive plasma cells/IgG-positive plasma cells. IgG4-positive lesions were determined as absent in 5 patients (4 with bilateral lacrimal/orbital lesions and one with a unilateral conjunctival lesion), none of whom showed systemic manifestations. In contrast, IgG4-positive lesions were present in 4 patients (3 with bilateral lacrimal/orbital lesions and one with a unilateral lacrimal/orbital lesion), who showed systemic manifestations : one with Hashimoto thyroiditis, one with IgG4-positive bilateral interstitial lung disease and hepatic inflammatory pseudotumor, one with bilateral interstitial lung disease, and one with systemic lymphadenopathy and antiphospholipid syndrome. In conclusion, IgG4-positive ocular adnexal benign lymphoid lesions might be used as a benchmark for the probable presence of other systemic lymphoid lesions.

Aims: To describe the results of a study of the incidence of conjunctival ulceration and its pathology as a manifestation of Behçet's syndrome. Methods: The authors reviewed retrospectively medical charts of 152 patients with Behçet's syndrome seen at the uveitis service of Okayama University Hospital from January 1995 to December 1999. Criteria used to diagnose Behçet's syndrome in this study required the presence of oral aphthous ulceration plus any two of three other manifestations—genital ulceration, eye lesions such as iridocyclitis and uveoretinitis, or skin lesions such as erythema nodosum. The presence of conjunctival ulceration was determined in patients with Behçet's syndrome through standardised ophthalmological examinations. A biopsy of the conjunctival ulceration was performed in one patient. The incidence of conjunctival ulceration in patients with Behçet's syndrome was calculated and the clinical and pathological features of this ulceration were examined. Results: Four of 152 patients (2.6%) developed conjunctival ulceration in concordance with exacerbation of their systemic symptoms. Histopathological examinations of a conjunctival biopsy specimen in one patient revealed intraepithelial and perivascular infiltration with neutrophils and lymphocytes, consistent with Behçet's syndrome. The conjunctival ulcerations of the study patients showed good response to topical corticosteroids or topical steroids plus oral colchicine. Conclusions: Conjunctival ulceration should be noted as an uncommon but possible manifestation of Behçet's syndrome. Accordingly, routine examination of the conjunctiva is recommended in patients with Behçet's syndrome, and Behçet's syndrome should be included in a list of differential diagnoses for patients with conjunctival ulcerations.