title: New Compact Accommodometer to Measure Accommodation Amplitude as a Biomarker.
abstract: OBJECTIVE
  This study aimed to evaluate a newly designed compact accommodometer (CA) and compare this with a conventional accommodometer for measuring accommodation as a biomarker for aging and lifestyle.
  
  
  METHODS
  This is an observational case series.
  
  
  METHODS
  Accommodative amplitude was measured using 2 different accommodometers in 114 patients. We obtained the data of the near-point accommodation amplitude. Subsequently, we used smoking habit as an example of lifestyle-related factor to evaluate its effect on the accommodative power.
  
  
  RESULTS
  The first part of the study included 60 eyes of 60 men and 54 eyes of 54 women, with a mean (SD) age of 43.8 (12.9) years (range, 18-58 years). There was a consistency within each measuring method despite a significant difference between the 2 devices (P < 0.01). Measuring accommodation by CA was significantly faster than by conventional modality (190.9 ± 58.1 seconds for CA and 371.8 ± 123.6 seconds for D'ACOMO, P < 0.0001, paired t test). In the second part of the study, we found a significant correlation between age and accommodative amplitude both in smokers and in nonsmokers. The accommodative amplitude of the smoker group was significantly lower than that of the nonsmoker group (P < 0.001).
  
  
  CONCLUSIONS
  Compact accommodometer may work as an alternative and convenient method in place of the conventional accommodometer for measuring accommodative amplitude as an aging biomarker. Lifestyle factors can affect the magnitude of accommodation, which can be measured by this newly developed CA.
authors.affiliation: From the *Minamiaoyama Eye Clinic Tokyo, Tokyo; †Department of Ophthalmology, Keio University School of Medicine, Tokyo; ‡Department of Ophthalmology, Tokyo Dental College, Ichikawa General Hospital, Chiba; and §Department of Ophthalmology, Social Insurance Chukyo Hospital, Aichi, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ide
authors.forename: Kazuno
authors.initials: K
authors.lastname: Negishi
authors.forename: Takefumi
authors.initials: T
authors.lastname: Yamaguchi
authors.forename: Shuya
authors.initials: S
authors.lastname: Hara
authors.forename: Ikuko
authors.initials: I
authors.lastname: Toda
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tsubota