High myopic schisis (HMF) has the clinical feature of separation between retinal layers. It is sometimes accompanied with foveal retinal detachment, macular lamellar hole, epiretinal membrane and vitreous retraction. HMF may develop to macular hole, macular detachment and will damage the visual function. Pars plana vitrectomy (PPV) is a commonly used surgery in the treatment of HMF. PPV together with internal limiting membrane (ILM) peeling and long-term gas tamponade was reported to be safe and effective. But nowadays there was no available long-term gas in our country. Also, whether ILM peeling is necessary remains controversial, Indole cyanine green (ICG)was proved to have potential toxicity to the retina and the ILM peeling has the risk of causing secondary macular hole. We propose to make a prospective nonrandomized controlled study to evaluate the safety and efficiency of using PPV alone in the treatment of HMF.

Inclusion Criteria:

1. Patients diagnosed as high myopic macular retinoschisis, with axial length more than 26.5mm.
2. Morphologic manifestation in OCT shows split between retinal layers in macular area.
3. Patients without severe systemic disease and can tolerate surgery.

Exclusion Criteria:

1. Patients also have other ocular disease, including glaucoma, keratitis,uveitis, retinal detachment,etc.
2. Patients with nystagmus or have difficult to open the eye.
3. Patients with severe systemic disease and cannot tolerate surgery.

Study population will be selected from the in-patients in Shanghai Aier Eye Hospital.

all individual participant data (IPD) that underlie results

After this study is finished the data will become available for 1year.

The analytical data will be accessed in published articles.