FICD

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adenylyltransferase FICD (EC 2.7.7.n1) (AMPylator FICD) (De-AMPylase FICD) (EC 3.1.4.-) (FIC domain-containing protein) (Huntingtin yeast partner E) (Huntingtin-interacting protein 13) (HIP-13) (Huntingtin-interacting protein E) [HIP13] [HYPE] [UNQ3041/PRO9857]

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Defining the limits of normal conjunctival fornix anatomy in a healthy South Asian population.

Quantifying the extent of conjunctival fibrosis for documentation of progression in conjunctival scarring disease is a clinical challenge. Measurement of forniceal foreshortening facilitates monitoring of these disorders. This study aims (1) to define the limits of the normal human conjunctival fornices and how these alter with age and (2) to provide normative data for upper and lower fornix depths (FDs) and fornix intercanthal distance (FICD) within a healthy South Asian, racially distinct population. Epidemiologic, cross-sectional study. A total of 240 subjects with national origins from South Asia, with no known ocular history and normal adnexal and conjunctival examination, aged 20 to 80 years. An FICD modification of a custom-designed fornix depth measurer (FDM) was validated and used for measurement of both lower and upper FDs together with FICDs in 480 healthy eyes with no ocular comorbidities. Data were analyzed using repeated-measures analysis of variance and presented as means with 95% confidence intervals (CIs). Mean lower and upper FDs and FICD for the entire cohort, stratified according to age decade and sex. For this South Asian population, the overall upper and lower FDs were 15.3 mm (95% CI, 14.9-15.6) and 10.9 mm (95% CI, 10.7-11.1), respectively, with FICD defined as 32.9 mm (95% CI, 32.5-33.4) (upper) and 31.7 mm (95% CI, 31.3-32.1) (lower). With increasing age, a progressive reduction of all measured parameters (P < 0.001) was noted, with female subjects having significantly shallower fornices (upper FD, P < 0.001; lower FD, P < 0.001; upper FICD, P = 0.081; and lower FICD, P = 0.015). This is the first study to define the limits of normal upper FD and FICDs in any population group. Our study demonstrates sex variations and progressive conjunctival shrinkage with age. Although it provides important, objective data for normal forniceal anatomy, further study is recommended in other populations to confirm the generalizability of these data or to enable normal comparative datasets for the assessment of conjunctival scarring disorders among all anthropological groups.

MeSH Terms

  • Adult
  • Age Distribution
  • Aged
  • Aged, 80 and over
  • Aging
  • Asia
  • Asian Continental Ancestry Group
  • Conjunctiva
  • Cross-Sectional Studies
  • Epidemiologic Studies
  • Eyelids
  • Female
  • Humans
  • Male
  • Middle Aged
  • Observer Variation
  • Reference Values
  • Sex Distribution
  • Young Adult