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Men with longer axial lengths may be at risk for normal tension glaucoma

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LAS VEGAS — Longer than normal axial lengths may be a risk factor for the development of normal tension glaucoma, according to a study by Japanese researchers.

Elsuo Chihara, MD, and colleagues measured the axial lengths of 153 eyes of patients with normal tension glaucoma (NTG) and 235 eyes of patients with primary open-angle glaucoma (POAG). They compared the findings to the axial lengths of 300 control eyes.

The researchers presented the results in a poster here at the American Academy of Ophthalmology meeting. They found that eyes in the NTG and POAG groups had similar refractive errors but differed in axial lengths. The mean axial length of eyes with NTG fell between the mean axial lengths of eyes with POAG and eyes in the control group.

Additionally, men with NTG had significantly longer mean axial lengths compared to men in the control group (P < .05). However, women with NTG had axial lengths similar to women in the control group, according to the study.

Both men and women in the POAG group had mean axial lengths that were significantly longer than those for the NTG and control groups, the authors noted.