Pediatric Ophthalmologist

Strabismus (Squints)

Symptoms and Signs


Strabismus is a failure of the two eyes to maintain proper alignment and work together as a team. There are several types of strabismus depends on the direction of the misalignment of the eyes: For example, esotropia, "crossed eyes" or "cross-eyed"), exotropia ("wall-eyed"), hypertropia or hypotropia. It can always affect the same eye (unilateral strabismus), or the two eyes in turns (alternating strabismus).

What causes it?

Some children have congenital strabismus (being born with it). In that case there may be a problem with the part of the nervous system that controls eye muscles, however, many times there is no clear cause. There is also the possibility of a tumor or eye disorder. Strabismus can appear later in life, and the main symptom is double vision. However, it also can be the sign of serious conditions like a stroke, so it is better to see a doctor immediately if such a symptom appears.

How is it treated?

Young children can avoid double vision by suppressing vision in a weaker eye, however, it may lead to amblyopia. Additionally, it may affect the visual field, so it is better to start treatment as soon as possible. If you do not, the condition could continue into adulthood. Mostly adults with crossed eyes were born that way.

Office hours






(no lunchtime.)


Our clinic is closed on 12/31, 1/1, 1/2, 1/3.


9th floor of Hulic Shinjuku Building,3-25-1, Shinjuku, Shinjuku-ku, Tokyo, 160-0022






Contact us

Online reservation


Doctor career

Director:Yasuhiro Shinkawa

(A board-certified ophthalmologist)


Japan Ophthalmological Society
Japanese Retina and Vitreous Society
Japanese Society of Ophthalmic Surgeons

Certification of Completion

Course of Ophthalmic PDT Study Group
Number of cataract surgery up to the present:About 4000


2001 Graduate-Medical Department of Kumamoto University
2002 Department of Ophthalmology Kyoto University School of medicine
2002 Shimada Municipal Hospital
2008 Japanese Red Cross Society
2010 Kitano Hospital The Tazuke Kofukai Medical Research Institute
2014 Shinjuku-Higashiguchi Eye Clinic


The eye clinic is the place where the patients, who have vision problems, can recover their eye function and feel how great ''I CAN SEE THINGS' 'is. When we share something impressive with the patients, we feel the happiest.
We’ll continue seeing the patients sincerely.
Thank you very much.


Doctor:Fumiyo Hasegawa

(A board-certified ophthalmologist)


Japan Ophthalmological Society
Japan Ophthalmologists Associasion
Japanese Association for Strabismus and Amblyopia(JASA)


1992 Graduate- Medical Department of Teikyo Univercity
2002 The head ophthalmologist at International Catholic Hospital
2020 Shinjuku-Higashiguchi Eye Clinic


Nowadays Japan has the issues of a super-aging society, and it is necessary to start caring the eyes from a young age in order to keep the eyes healthy.
I believe it is very important to examine and diagnose by understanding what patients are worried about, and giving individualized treatment plans.
My belief is to help and support all patients keeping their eyes well-conditioned throughout the life. If there's anything you are worried about, even the small things, please do not hesitate to ask me. Thank you.

We have 1 full-time service orthoptist, 5 part-time orthoptists, 1 full-time nurse and 3 part-time nurses in our clinic.
Another several ophthalmologists are working here.