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       XXVI Annual Congress of the Iranian Society of Ophthalmology        بـیــست و ششمین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران
مقاله Abstract


Title: Binocular and accommodative characteristics in a normal population
Author(s): AbbasAli Yekta, Hassan Hashemi, Hadi Ostadimoghaddam, Somayeh Ghasemi-moghaddam, Payam Nabovati, Ehsan Shiralivand, Mehdi Khabazkhoob
Presentation Type: Oral
Subject: Strabismus & Neuro-ophthalmology
Others:
Presenting Author:
Name: Mehdi Khabaz khob
Affiliation :(optional) Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran
E mail: khabazkhoob@yahoo.com
Phone:
Mobile: 09120250544
Purpose:

To study binocular and accommodative characteristics and their associations with age and gender in a population of young Iranian adults

Methods:

In this cross-sectional study, multistage cluster sampling was done from the students of Mashhad University of Medical Sciences. All participants had visual acuity, refraction, and cover-tests followed by measurements of the near point of convergence (NPC), Amplitude of accommodation (AA), monocular and binocular accommodative facility (MAF and BAF) using ±2.00 diopter (D) flipper lenses and negative and positive relative accommodation (NRA and PRA). Near and distance fusional vergence reserves were measured using prism bar, and near associated phoria was assessed using the Mallett Unit

Results:

The mean age of the participants was 22.4±4.3 years (range: 18-35 years). Mean distance dissociated phoria, near dissociated phoria, near associated phoria, , gradient AC/A ratio, NPC, MAF,BAF, NRA, PRA and AA in the studied sample was 1.11exophoria ±1.96 (PD), 5 exophoria ±4.67 (PD), 0.51 exophoria ±1.02 (PD), 4.67 ±1.56, 5.16 ±3.65 (cm), 11.95 ±5.63 (cpm), 9.41 ±4.66 (cpm), 2.48 ±0.46 (D), -2.99 ±0.79 (D) and 11.22 ±2.6 (D), respectively. In the multiple regression model including age and gender, near exophoria was significantly higher in men and levels of near base-out-break and near base-out-recovery were higher in females. Distance exophoria, distance base-in-break, distance base-in-recovery and NPC increased with age and near base-out-break, PRA, BAF, MAF and AA significantly decreased with age

Conclusion:

Studied indices in this study significantly differ from available guidelines and these differences must be considered when making diagnostic or therapeutic decisions. Certain indices can be affected by age and gender

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